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Fossils are generally found in:- a)Metamorphic rocks
- b)Igneous rocks
- c)Sedimentary rocks
- d)Any type of rock
Correct answer is option 'C'. Can you explain this answer?
Fossils are generally found in:
a)
Metamorphic rocks
b)
Igneous rocks
c)
Sedimentary rocks
d)
Any type of rock
|
Geetika Shah answered |
Fossils are generally found in sedimentary rocks.
Which of the following is the relatively most accurate method for dating of fossils?
[2005]
- a)Electron Spin Resonance method
- b)Potassium-argon method
- c)Radio-carbon method
- d)Uranium-lead method
Correct answer is option 'A'. Can you explain this answer?
Which of the following is the relatively most accurate method for dating of fossils?
[2005]
a)
Electron Spin Resonance method
b)
Potassium-argon method
c)
Radio-carbon method
d)
Uranium-lead method
|
Megha Joshi answered |
Electron Spin Resonance Method for Dating Fossils
The most accurate method for dating fossils is the Electron Spin Resonance (ESR) method. Let's understand the method in detail:
What is Electron Spin Resonance Method?
Electron Spin Resonance (ESR) dating is a method that is used to date materials containing atoms with unpaired electrons, such as organic and inorganic materials, tooth enamel, and fossil bones. This method is based on the fact that electrons become trapped in the mineral's crystalline structure over time due to exposure to natural radiation. The trapped electrons then accumulate over time, and their number can be measured to determine the age of the fossil.
Advantages of ESR Method:
1. Accurate: The ESR method is relatively more accurate than other dating methods.
2. Wide Range of Application: The ESR method can be used to date materials that are millions of years old.
3. Non-destructive: The ESR method is a non-destructive method, which means that the fossil can be preserved after the testing is done.
Limitations of ESR Method:
1. Requires Large Sample: The ESR method requires a relatively large sample size, which may not always be possible in the case of fossils.
2. Limited Availability: The ESR method is not widely available, and only a few laboratories are equipped to perform the testing.
3. Complex Process: The ESR method is a complex process that requires specialized equipment and trained personnel.
Conclusion:
In conclusion, the ESR method is considered the most accurate method for dating fossils. Although it has some limitations, the ESR method provides valuable information about the age of fossils and their evolutionary history.
The most accurate method for dating fossils is the Electron Spin Resonance (ESR) method. Let's understand the method in detail:
What is Electron Spin Resonance Method?
Electron Spin Resonance (ESR) dating is a method that is used to date materials containing atoms with unpaired electrons, such as organic and inorganic materials, tooth enamel, and fossil bones. This method is based on the fact that electrons become trapped in the mineral's crystalline structure over time due to exposure to natural radiation. The trapped electrons then accumulate over time, and their number can be measured to determine the age of the fossil.
Advantages of ESR Method:
1. Accurate: The ESR method is relatively more accurate than other dating methods.
2. Wide Range of Application: The ESR method can be used to date materials that are millions of years old.
3. Non-destructive: The ESR method is a non-destructive method, which means that the fossil can be preserved after the testing is done.
Limitations of ESR Method:
1. Requires Large Sample: The ESR method requires a relatively large sample size, which may not always be possible in the case of fossils.
2. Limited Availability: The ESR method is not widely available, and only a few laboratories are equipped to perform the testing.
3. Complex Process: The ESR method is a complex process that requires specialized equipment and trained personnel.
Conclusion:
In conclusion, the ESR method is considered the most accurate method for dating fossils. Although it has some limitations, the ESR method provides valuable information about the age of fossils and their evolutionary history.
Convergent evolution is illustrated by[2003]- a)dogfish and whale
- b)rat and dog
- c)bacterium and protozoan
- d)starfish and cuttle fish
Correct answer is option 'A'. Can you explain this answer?
Convergent evolution is illustrated by
[2003]
a)
dogfish and whale
b)
rat and dog
c)
bacterium and protozoan
d)
starfish and cuttle fish
|
Ritika Khanna answered |
Independent formation of functionally similar structures by unrelated organism is called convergent evolution.
Tendrils in plants are an example of
- a)Adaptive radiation
- b)Convergent evolution
- c)Divergent evolution
- d)Co-evolution
Correct answer is option 'C'. Can you explain this answer?
Tendrils in plants are an example of
a)
Adaptive radiation
b)
Convergent evolution
c)
Divergent evolution
d)
Co-evolution
|
Ayush Singh answered |
Yes answer should be convergent because no thorns were asked in ques tendrils are many types originating from leaf,stem,stipule which are different in origin
There is no life on moon due to the absence of[2002]- a)O2
- b)water
- c)light
- d)temperature
Correct answer is option 'B'. Can you explain this answer?
There is no life on moon due to the absence of
[2002]
a)
O2
b)
water
c)
light
d)
temperature
|
|
Naina Dey answered |
Explanation:
The moon is a lifeless celestial body and there are several factors that contribute to the absence of life on the moon. Out of these factors, the absence of water is the most significant reason. Let us discuss this in detail:
1. Absence of Water:
Water is an essential requirement for life to exist. It is a vital component for the survival of most living organisms, including humans. The moon's surface is dry and barren and there is no evidence of liquid water on the moon. Although there is some water on the moon in the form of ice, it is not sufficient to support life.
2. Lack of Atmosphere:
The moon has a very thin and weak atmosphere. It does not have a protective ozone layer like the Earth, which shields us from harmful radiation from the sun. This means that the moon's surface is constantly exposed to harmful radiation and solar winds, making it a hostile environment for life.
3. Extreme Temperatures:
The moon's surface experiences extreme temperatures ranging from -173°C to 127°C. These extreme temperatures make it impossible for any living organism to survive on the moon.
4. Lack of Organic Matter:
Organic matter is a vital component for the existence of life. It is the building block of all living organisms. The moon's surface does not contain any organic matter, which makes it impossible for life to exist.
Conclusion:
In conclusion, the absence of water is the most significant reason why life cannot exist on the moon. The lack of atmosphere, extreme temperatures, and absence of organic matter are also contributing factors.
The moon is a lifeless celestial body and there are several factors that contribute to the absence of life on the moon. Out of these factors, the absence of water is the most significant reason. Let us discuss this in detail:
1. Absence of Water:
Water is an essential requirement for life to exist. It is a vital component for the survival of most living organisms, including humans. The moon's surface is dry and barren and there is no evidence of liquid water on the moon. Although there is some water on the moon in the form of ice, it is not sufficient to support life.
2. Lack of Atmosphere:
The moon has a very thin and weak atmosphere. It does not have a protective ozone layer like the Earth, which shields us from harmful radiation from the sun. This means that the moon's surface is constantly exposed to harmful radiation and solar winds, making it a hostile environment for life.
3. Extreme Temperatures:
The moon's surface experiences extreme temperatures ranging from -173°C to 127°C. These extreme temperatures make it impossible for any living organism to survive on the moon.
4. Lack of Organic Matter:
Organic matter is a vital component for the existence of life. It is the building block of all living organisms. The moon's surface does not contain any organic matter, which makes it impossible for life to exist.
Conclusion:
In conclusion, the absence of water is the most significant reason why life cannot exist on the moon. The lack of atmosphere, extreme temperatures, and absence of organic matter are also contributing factors.
Which one of the following statement is correct?[2007]- a)There is no evidence of the existence of gills during embryogenesis of mammals
- b)All plant and animal cells are totipotent
- c)Ontogeny repeats phylogeny
- d)Stem cells are specialize cells.
Correct answer is option 'C'. Can you explain this answer?
Which one of the following statement is correct?
[2007]
a)
There is no evidence of the existence of gills during embryogenesis of mammals
b)
All plant and animal cells are totipotent
c)
Ontogeny repeats phylogeny
d)
Stem cells are specialize cells.
|
Gowri Nair answered |
Ontogeny repeats phylogeny.
Evolution is- a)Progressive development of race
- b)History of race
- c)History and development of a race along with variations
- d)Development of race
Correct answer is 'C'. Can you explain this answer?
Evolution is
a)
Progressive development of race
b)
History of race
c)
History and development of a race along with variations
d)
Development of race
|
Pooja Mehta answered |
The term evolution was coined by Herbert Spencer, an English philosopher which means unrolling or unfolding of nature that brings about an orderly change from one form or condition to another resulting in descendants becoming different from ancestors. Thus, it is history and development of race along with variations.
Which of the following are homologous organs?[2002]- a)Wings of birds and locust
- b)Wings of birds (sparrow) and pectoral fins of fish
- c)Wings of bat and butterfly
- d)Legs of frog and cockroach
Correct answer is option 'B'. Can you explain this answer?
Which of the following are homologous organs?
[2002]
a)
Wings of birds and locust
b)
Wings of birds (sparrow) and pectoral fins of fish
c)
Wings of bat and butterfly
d)
Legs of frog and cockroach
|
Anshu Saha answered |
Homologous organs are those organs, which have the same origin and similar basic structure but may differ in external appearance and function. Wings of birds and pectoral fins of fishes are an example of the homologous organs.
Darwin judged the fitness of an individual by- a)Dominance over other individual
- b)Strategy to obtain food
- c)Ability to defend itself
- d)Number of offspring
Correct answer is option 'D'. Can you explain this answer?
Darwin judged the fitness of an individual by
a)
Dominance over other individual
b)
Strategy to obtain food
c)
Ability to defend itself
d)
Number of offspring
|
Rajeev Saxena answered |
Darwin realised that under the intense competition of members in a population, any variation which favoured survival in a particular environment would increase the individuals ability to reproduce and leave fertile offsprings. While less favourable variations decrease the chance of successful reproduction. Hence, Darwin judged the fitness of an individual by reproducing ability and the number of offsprings.
Age of fossils in the past was generally determined by radio-carbon method and other methods involving radioactive elements found in the rocks. More precise methods, which were used recently and led to the revision of the evolutionary periods for different groups of organisms, includes[2004]- a)study of carbohydrates / proteins in fossils
- b)study of the conditions of fossilization
- c)electron spin resonance (ESR) and fossil DNA
- d)study of carbohydrates / proteins in rocks
Correct answer is option 'C'. Can you explain this answer?
Age of fossils in the past was generally determined by radio-carbon method and other methods involving radioactive elements found in the rocks. More precise methods, which were used recently and led to the revision of the evolutionary periods for different groups of organisms, includes
[2004]
a)
study of carbohydrates / proteins in fossils
b)
study of the conditions of fossilization
c)
electron spin resonance (ESR) and fossil DNA
d)
study of carbohydrates / proteins in rocks
|
Ruchi Chakraborty answered |
ESR, Electron Spin Resonance measures number of charges occupying deep traps in crystal band gap.
Electron Paramagnetic Resonance (EPR) or Electron Spin Resonance (ESR) is a spectroscopic technique which detects species that have unpaired electrons, generally meaning that the molecule in question is a free radical if it is an organic molecule, or that it has transition metal ions if it is an inorganic complex. Because most stable molecules have a closed-shell configuration without a suitable unpaired spin, the technique is less widely used than nuclear magnetic resonance (NMR). The EPR was first discovered in Kazan State University by Soviet physicist Yevgeniy Zavoyskiy in 1944
Electron Paramagnetic Resonance (EPR) or Electron Spin Resonance (ESR) is a spectroscopic technique which detects species that have unpaired electrons, generally meaning that the molecule in question is a free radical if it is an organic molecule, or that it has transition metal ions if it is an inorganic complex. Because most stable molecules have a closed-shell configuration without a suitable unpaired spin, the technique is less widely used than nuclear magnetic resonance (NMR). The EPR was first discovered in Kazan State University by Soviet physicist Yevgeniy Zavoyskiy in 1944
What is common to whale, seal and shark?[2007]- a)Thick subcutaneous fat
- b)Convergent evolution
- c)Homoiothermy
- d)Seasonal migration.
Correct answer is option 'B'. Can you explain this answer?
What is common to whale, seal and shark?
[2007]
a)
Thick subcutaneous fat
b)
Convergent evolution
c)
Homoiothermy
d)
Seasonal migration.
|
Sarthak Saini answered |
The analogous organs show convergent evolution due to similar adaptation. They do not support organic evolution. Whale, seal and shark shows convergent evolution due to similar habitats.
It is believed that the first organisms which inhabitated earth's surface were
[MP PMT 01]
- a)Autotrophs
- b)Mixotrophs
- c)Bacteria
- d)Chromatotrophs
Correct answer is option 'C'. Can you explain this answer?
It is believed that the first organisms which inhabitated earth's surface were
[MP PMT 01]
a)
Autotrophs
b)
Mixotrophs
c)
Bacteria
d)
Chromatotrophs
|
Srishti Shah answered |
The first organisms that inhabited Earth's surface were bacteria. This is supported by several lines of evidence.
Fossil Record:
The oldest fossils found on Earth are of bacteria-like organisms. These fossils date back to 3.5 billion years ago. These bacteria were anaerobic, which means that they did not require oxygen to survive.
Chemical Evidence:
The chemical composition of rocks that are 3.8 billion years old suggests that they were formed by bacteria. These rocks contain isotopes of carbon that are only produced by living organisms.
Evolutionary History:
Bacteria are the most ancient and diverse group of organisms on Earth. They have been evolving for billions of years and have adapted to almost every environment on the planet.
Autotrophs and Mixotrophs:
Autotrophs are organisms that can produce their own food using energy from the sun or from inorganic compounds. Mixotrophs are organisms that can switch between being autotrophic and heterotrophic (consuming other organisms for food). While these types of organisms are important in the history of life on Earth, they did not appear until much later in evolution.
Chromatotrophs:
Chromatotrophs are bacteria that use chemicals as their source of energy. While these types of bacteria are also ancient, they are not believed to be the first organisms on Earth.
In conclusion, the first organisms that inhabited Earth's surface were bacteria. They have been evolving for billions of years and have adapted to almost every environment on the planet.
Fossil Record:
The oldest fossils found on Earth are of bacteria-like organisms. These fossils date back to 3.5 billion years ago. These bacteria were anaerobic, which means that they did not require oxygen to survive.
Chemical Evidence:
The chemical composition of rocks that are 3.8 billion years old suggests that they were formed by bacteria. These rocks contain isotopes of carbon that are only produced by living organisms.
Evolutionary History:
Bacteria are the most ancient and diverse group of organisms on Earth. They have been evolving for billions of years and have adapted to almost every environment on the planet.
Autotrophs and Mixotrophs:
Autotrophs are organisms that can produce their own food using energy from the sun or from inorganic compounds. Mixotrophs are organisms that can switch between being autotrophic and heterotrophic (consuming other organisms for food). While these types of organisms are important in the history of life on Earth, they did not appear until much later in evolution.
Chromatotrophs:
Chromatotrophs are bacteria that use chemicals as their source of energy. While these types of bacteria are also ancient, they are not believed to be the first organisms on Earth.
In conclusion, the first organisms that inhabited Earth's surface were bacteria. They have been evolving for billions of years and have adapted to almost every environment on the planet.
According to abiogenesis life originates from ______.- a)Pre-exiting life
- b)Extra-terrestrial matter
- c)Non-living matter
- d)Chemicals
Correct answer is 'C'. Can you explain this answer?
According to abiogenesis life originates from ______.
a)
Pre-exiting life
b)
Extra-terrestrial matter
c)
Non-living matter
d)
Chemicals
|
Hansa Sharma answered |
According to abiogenesis theory of origin of life, life originated from non-living matter like gases, inorganic substance and water at particular temperature and pressure.
What is most important for origin of life
[AFMC 78]
- a)Water
- b)Oxygen
- c)Carbon
- d)Nitrogen
Correct answer is option 'C'. Can you explain this answer?
What is most important for origin of life
[AFMC 78]
a)
Water
b)
Oxygen
c)
Carbon
d)
Nitrogen
|
|
preeti answered |
All the life in evolution when originate origin in water so water is the most essential condition for origin of life.All life forms were in water environment only.
Thorn of Bougainvillea and tendril of cucurbita are example of[2008]- a)analogous organs
- b)homologous organs
- c)vestigial organs
- d)retrogressive evolution
Correct answer is option 'B'. Can you explain this answer?
Thorn of Bougainvillea and tendril of cucurbita are example of
[2008]
a)
analogous organs
b)
homologous organs
c)
vestigial organs
d)
retrogressive evolution
|
|
Kadambala Hemalatha answered |
Thorns of bougainvillea and tendril of cucurbita arises from axilay bud, but they perform different functions. thorns are use full for protection from predetars, tendril s are use full for climbing hence this are homologous organs
Animals have the innate ability to escape from predation. Examples for the same are given below. Select the incorrect example.[2005]- a)Colour change in Chameleon
- b)Enlargement of body size by swallowing air in puffer fish
- c)Poison fangs in snakes
- d)Melanism in moths
Correct answer is option 'C'. Can you explain this answer?
Animals have the innate ability to escape from predation. Examples for the same are given below. Select the incorrect example.
[2005]
a)
Colour change in Chameleon
b)
Enlargement of body size by swallowing air in puffer fish
c)
Poison fangs in snakes
d)
Melanism in moths
|
|
Ritika Khanna answered |
Animals resist predation by cryptic coloration deceptive marking, behavioural defenses and possession of mechanical or chemical defenses. Examples are colour change in Chameleon Enlargement of body size by swallowing air in potter fish, Melanism in moths.
- a)Geographical evolution
- b)Convergent evolution
- c)Divergent evolution
- d)Adaptive radiation
Correct answer is 'D'. Can you explain this answer?
|
|
Rajat Kapoor answered |
The diversification of an ancestral group into two or more species in different habitats is called divergent evolution. When this involves large number of species to occupy different ritches, this is called adaptive radiation. Adaptive radiation is the process of evolution of different species in a given geographical area starting from a species of animals or plants and literally radiating to other areas of geography (habitats). Darwin's finches represent one of best examples of this phenomenon. Australian marsupials are another example of adaptive radiation.
Homo sapiens arose in Africa and moved across continents and developed into distinct races during?- a)Ice age between 75000-10,000 years ago
- b)Ice age between 5000-6000 years ago
- c)Stone age between 10,000 years ago
- d)Stone age between 2000-4000 years ago
Correct answer is option 'A'. Can you explain this answer?
Homo sapiens arose in Africa and moved across continents and developed into distinct races during?
a)
Ice age between 75000-10,000 years ago
b)
Ice age between 5000-6000 years ago
c)
Stone age between 10,000 years ago
d)
Stone age between 2000-4000 years ago
|
|
Kushagra Budhgaya answered |
Answer A is correct. why don't you go through the ncert once.
Which of the following bird will be called most successfully evolved?- a)Lays 5 eggs, 5 hatch and 5 reproduce
- b)Lays 9 eggs, 9 hatch and 3 reproduce
- c)Lays 2 eggs, 2 hatch and 2 reproduce
- d)Lays 10 eggs, 5 hatch and 4 reproduce
Correct answer is option 'A'. Can you explain this answer?
Which of the following bird will be called most successfully evolved?
a)
Lays 5 eggs, 5 hatch and 5 reproduce
b)
Lays 9 eggs, 9 hatch and 3 reproduce
c)
Lays 2 eggs, 2 hatch and 2 reproduce
d)
Lays 10 eggs, 5 hatch and 4 reproduce
|
Rupesh Ganguli answered |
Correct answer is a because according to Darwin the who leaves more Number of reproducing individuals are more successful
Sequence of which of the followings is used to know the phylogeny?[2002]- a)mRNA
- b)rRNA
- c)tRNA
- d)DNA
Correct answer is option 'B'. Can you explain this answer?
Sequence of which of the followings is used to know the phylogeny?
[2002]
a)
mRNA
b)
rRNA
c)
tRNA
d)
DNA
|
|
Ruchi Chakraborty answered |
rRNA occurs in side ribosomes and involved in protein synthesis, mRNA brings coded information from DNA to form polypeptides. tRNA takes part in transferring amino acids from cellular pool to episomes for polymerization to form polypeptides.
Carl Woese gave the theory of life based on his discovery that the genes encoding ribosomal RNA are ancient and distributed over all lineages of life with little or no gene transfer. Therefore rRNA are commonly used to infer phylogeny.
Carl Woese gave the theory of life based on his discovery that the genes encoding ribosomal RNA are ancient and distributed over all lineages of life with little or no gene transfer. Therefore rRNA are commonly used to infer phylogeny.
According to Oparin, which one of the following was not present in the primitive atmosphere of the earth[2004]- a)Methane
- b)Oxygen
- c)Hydrogen
- d)Water vapour
Correct answer is option 'B'. Can you explain this answer?
According to Oparin, which one of the following was not present in the primitive atmosphere of the earth
[2004]
a)
Methane
b)
Oxygen
c)
Hydrogen
d)
Water vapour
|
Snehal Shah answered |
According to Oparin, the atmosphere of calmative earth was reducing because its atoms were most numerous and most reactive. Free oxygen was not present in significant amount.
Large quantities of H2, N2, water vapour, CO2, CH4 and NH3 were present.
Large quantities of H2, N2, water vapour, CO2, CH4 and NH3 were present.
Fossils are most commonly preserved in______.- a)Sedimentary rocks
- b)Igneous rocks
- c)Metamorphic rocks
- d)Any type of rock
Correct answer is option 'A'. Can you explain this answer?
Fossils are most commonly preserved in______.
a)
Sedimentary rocks
b)
Igneous rocks
c)
Metamorphic rocks
d)
Any type of rock
|
Prerana M N answered |
Sedimentary rocks are mostly involved in forming fossils, owing to the way in which they are formed.
In which condition the gene ratio remains constant for any species?[2002]- a)Sexual selection
- b)Random mating
- c)Mutation
- d)Gene flow
Correct answer is option 'B'. Can you explain this answer?
In which condition the gene ratio remains constant for any species?
[2002]
a)
Sexual selection
b)
Random mating
c)
Mutation
d)
Gene flow
|
Prisha Singh answered |
Mutation is any random sudden heritable change occurring in the genetic material. Sexual selection refers to selection of a mate by an organism.
Which of the following is most important for speciation ?[2002]- a)Seasonal isolation
- b)Reproductive isolation
- c)Behavioural isolation
- d)Tropical isolation
Correct answer is option 'A'. Can you explain this answer?
Which of the following is most important for speciation ?
[2002]
a)
Seasonal isolation
b)
Reproductive isolation
c)
Behavioural isolation
d)
Tropical isolation
|
Vaibhav Basu answered |
Seasonal isolation refers to the differences in season of breeding that can isolate two varieties. Behavioural or ethological isolation refers to differences in behaviour like courtship rituals etc. to prevent mating. Mechanical isolation refers to the differences in the position, size and structure of animal genitalia which prevent reproductive contact and thus bring about isolation.
An inter-breeding population of finches became separated geographically, forming two isolated groups. Each group then became subject to different selective pressures. One group was then introduced into the habitat of the other. Which one of the following would determine whether they now formed two distinct species?- a)They had been separated for more than three million years
- b)They failed to produce fertile F1 hybrids
- c)They showed marked differences in the shape of their beaks
- d)Their plumage had become markedly different
Correct answer is option 'B'. Can you explain this answer?
An inter-breeding population of finches became separated geographically, forming two isolated groups. Each group then became subject to different selective pressures. One group was then introduced into the habitat of the other. Which one of the following would determine whether they now formed two distinct species?
a)
They had been separated for more than three million years
b)
They failed to produce fertile F1 hybrids
c)
They showed marked differences in the shape of their beaks
d)
Their plumage had become markedly different
|
Mira Joshi answered |
Once inter-breeding population of finches, now have failed to produce fertile F1 hybrids, this means they have now formed two distinct species.
Theory of spontaneous generation believed that : [NCERT 773]
- a)Life of originated from othe similar organisms or spontaneously
- b)life arises from the non-living matter
- c)Life originated from similar organisms
- d)Life originated from air
Correct answer is option 'B'. Can you explain this answer?
Theory of spontaneous generation believed that : [NCERT 773]
a)
Life of originated from othe similar organisms or spontaneously
b)
life arises from the non-living matter
c)
Life originated from similar organisms
d)
Life originated from air
|
Mayank Chavan answered |
Believers of spontaneous generation believed that life originated only spontaneously. Let's understand this statement in detail.
Explanation:
Spontaneous generation is the theory that proposed that living organisms could arise from non-living matter under certain conditions. This theory was widely accepted for many centuries, until it was disproven by Louis Pasteur in the mid-19th century.
a) Life originated from other similar organisms or spontaneously:
According to the theory of spontaneous generation, life could arise either from other similar organisms or spontaneously from non-living matter. However, this is not the correct answer as the believers of spontaneous generation did not consider the possibility of life originating from other similar organisms.
b) Life originated only spontaneously:
This is the correct answer. The believers of spontaneous generation argued that life could only originate spontaneously from non-living matter. They believed that under certain conditions, such as the presence of air, moisture, and organic material, life could arise spontaneously.
c) Life originated from similar organisms:
This is not the correct answer. The believers of spontaneous generation did not consider the possibility of life originating from similar organisms. They believed that life could only arise from non-living matter.
d) Life originated from air:
While air was considered to be one of the necessary conditions for spontaneous generation, it was not believed to be the source of life. The believers of spontaneous generation thought that life could originate from the combination of non-living matter, air, and other environmental factors.
In conclusion, the correct answer is option 'B' - the believers of spontaneous generation believed that life originated only spontaneously from non-living matter under certain conditions. However, it's important to note that this theory has been disproven by scientific experiments and observations, and the modern understanding of life's origin is based on the principles of biogenesis, which states that life only arises from pre-existing life.
Explanation:
Spontaneous generation is the theory that proposed that living organisms could arise from non-living matter under certain conditions. This theory was widely accepted for many centuries, until it was disproven by Louis Pasteur in the mid-19th century.
a) Life originated from other similar organisms or spontaneously:
According to the theory of spontaneous generation, life could arise either from other similar organisms or spontaneously from non-living matter. However, this is not the correct answer as the believers of spontaneous generation did not consider the possibility of life originating from other similar organisms.
b) Life originated only spontaneously:
This is the correct answer. The believers of spontaneous generation argued that life could only originate spontaneously from non-living matter. They believed that under certain conditions, such as the presence of air, moisture, and organic material, life could arise spontaneously.
c) Life originated from similar organisms:
This is not the correct answer. The believers of spontaneous generation did not consider the possibility of life originating from similar organisms. They believed that life could only arise from non-living matter.
d) Life originated from air:
While air was considered to be one of the necessary conditions for spontaneous generation, it was not believed to be the source of life. The believers of spontaneous generation thought that life could originate from the combination of non-living matter, air, and other environmental factors.
In conclusion, the correct answer is option 'B' - the believers of spontaneous generation believed that life originated only spontaneously from non-living matter under certain conditions. However, it's important to note that this theory has been disproven by scientific experiments and observations, and the modern understanding of life's origin is based on the principles of biogenesis, which states that life only arises from pre-existing life.
By studying analogous structures we look for ______.- a)Similarities in appearance but differences in functions
- b)Similarities in appearance and function but different in structure
- c)Similarities in organ structure
- d)Similarities in cell make up
Correct answer is option 'B'. Can you explain this answer?
By studying analogous structures we look for ______.
a)
Similarities in appearance but differences in functions
b)
Similarities in appearance and function but different in structure
c)
Similarities in organ structure
d)
Similarities in cell make up
|
Lavanya Menon answered |
Analogous organs are those organs which have the same function but are quite different in their fundamental structure and embryonic origin. For example, the wing of an insect and the wing of a bird are analogous organs. Both these organs are used for flying in the air but they re very different in structure. An insect wing is an extension of the integument whereas a bird wing is formed of limb bones covered with flesh, skin, and feathers. Each has evolved from a separate ancestral population as a means of a more efficient mode of locomotion. Similarity developed in distantly related groups as an adaptation for the same function is called analogy or convergent evolution.
Thus, the correct answer is option B.
Mortality in babies is an example of ______- a)Stabilizing selection
- b)Directional selection
- c)Disruptive selection
- d)Abortion selection
Correct answer is option 'A'. Can you explain this answer?
Mortality in babies is an example of ______
a)
Stabilizing selection
b)
Directional selection
c)
Disruptive selection
d)
Abortion selection
|
EduRev NEET answered |
- Mortality in babies is an example of stabilizing selection.
- It is all depended on the baby’s birth weight.
- The optimum birth weight is 7.3 pounds which favor this selection.
- Newborn infants with less than 5.5 pounds and more than 10 pounds have the highest mortality rate.
Links between organisms that show branching pattern of evolutionary relationships are shown by- a)Phylogenetic trees
- b)Living fossils
- c)Comparative embryology
- d)Two fossil layers
Correct answer is option 'A'. Can you explain this answer?
Links between organisms that show branching pattern of evolutionary relationships are shown by
a)
Phylogenetic trees
b)
Living fossils
c)
Comparative embryology
d)
Two fossil layers
|
|
Krithika Kumar answered |
Phylogenetic trees are diagrams that show the evolutionary relationships between different organisms. They are used to display the branching pattern of evolutionary relationships between organisms. The diagram looks like a tree with branches that represent different groups of organisms. These branches are called clades, and they represent groups of organisms that have descended from a common ancestor.
Phylogenetic trees are constructed based on a variety of data, including:
1. Morphological characteristics: The physical features of organisms, such as their shape, size, and structure.
2. Molecular data: DNA and RNA sequences are used to compare the genetic makeup of different organisms.
3. Fossil records: The study of fossils provides evidence of the evolutionary history of organisms.
Phylogenetic trees are an important tool for understanding the relationships between organisms and how they have evolved over time. They can be used to answer questions about the origins of different species and how they are related to one another.
In conclusion, phylogenetic trees are diagrams that show the branching pattern of evolutionary relationships between organisms. They are constructed based on a variety of data, including morphological characteristics, molecular data, and fossil records. They are an important tool for understanding the evolutionary history of organisms.
Phylogenetic trees are constructed based on a variety of data, including:
1. Morphological characteristics: The physical features of organisms, such as their shape, size, and structure.
2. Molecular data: DNA and RNA sequences are used to compare the genetic makeup of different organisms.
3. Fossil records: The study of fossils provides evidence of the evolutionary history of organisms.
Phylogenetic trees are an important tool for understanding the relationships between organisms and how they have evolved over time. They can be used to answer questions about the origins of different species and how they are related to one another.
In conclusion, phylogenetic trees are diagrams that show the branching pattern of evolutionary relationships between organisms. They are constructed based on a variety of data, including morphological characteristics, molecular data, and fossil records. They are an important tool for understanding the evolutionary history of organisms.
What is correct arrangement of periods of palaeozoic era in ascending order in geological time scale?- a)Cambrian → Devonian → Ordovician → Silurian → Carboniferous → Permian
- b)Cambrian → Ordovician → Silurian → Devonian → Carboniferous → Permian
- c)Cambrian → Ordovician Devonian → Silurian → Carboniferous → Permian
- d)Silurian → Devonian → Cambrian → Ordovician Permian → Carboniferous
Correct answer is option 'B'. Can you explain this answer?
What is correct arrangement of periods of palaeozoic era in ascending order in geological time scale?
a)
Cambrian → Devonian → Ordovician → Silurian → Carboniferous → Permian
b)
Cambrian → Ordovician → Silurian → Devonian → Carboniferous → Permian
c)
Cambrian → Ordovician Devonian → Silurian → Carboniferous → Permian
d)
Silurian → Devonian → Cambrian → Ordovician Permian → Carboniferous
|
Vivek Patel answered |
Palaezoic era is the era of ancient life and correct arrangement of periods in this era is:
Which one of the following is not a living fossil?[2006]- a)Sphenodon
- b)Archaeopteryx
- c)Peripatus
- d)King crab
Correct answer is option 'B'. Can you explain this answer?
Which one of the following is not a living fossil?
[2006]
a)
Sphenodon
b)
Archaeopteryx
c)
Peripatus
d)
King crab
|
Krish Saha answered |
Archaeopteryx is a fossile (dead) found from the mesozoic rocks. It is a connecting link between reptiles and birds.
In a random mating population in equilibrium, which of the following brings about a change in gene frequency in a non-directional manner?[2003]- a)Migration
- b)Mutations
- c)Random drift
- d)Selection
Correct answer is option 'C'. Can you explain this answer?
In a random mating population in equilibrium, which of the following brings about a change in gene frequency in a non-directional manner?
[2003]
a)
Migration
b)
Mutations
c)
Random drift
d)
Selection
|
Mahesh Saini answered |
Migration refers to the movement of individuals into and out of population. Mutation refers to random and sudden heritable variations or changes arising in the genetic constitution.
Praying mantis is a good example of- a)Warning colouration
- b)Social insects
- c)Mullerianmimcry
- d)Camouflage
Correct answer is option 'D'. Can you explain this answer?
Praying mantis is a good example of
a)
Warning colouration
b)
Social insects
c)
Mullerianmimcry
d)
Camouflage
|
|
Ankit Kumar answered |
Nice question...
but i know this question's answer sorry
but i know this question's answer sorry
When two species of different genealog y come to resemble each other as a result of adaptation, the phenomenon is termed[2007]- a)microevolution
- b)co-evolution
- c)convergent evolution
- d)divergent evolution
Correct answer is option 'C'. Can you explain this answer?
When two species of different genealog y come to resemble each other as a result of adaptation, the phenomenon is termed
[2007]
a)
microevolution
b)
co-evolution
c)
convergent evolution
d)
divergent evolution
|
|
Sarthak Saini answered |
The analogous organs show convergent evolution due to similar adaptions which do not support organic evolution.
The similarity of bone structure in the forelimbs of many vertebrates is an example of [NEET 2018]- a)Homology
- b)Analogy
- c)Convergent evolution
- d)Adaptive radiation
Correct answer is option 'A'. Can you explain this answer?
The similarity of bone structure in the forelimbs of many vertebrates is an example of [NEET 2018]
a)
Homology
b)
Analogy
c)
Convergent evolution
d)
Adaptive radiation
|
|
Mira Joshi answered |
- Homologous organs are those organs that have the same fundamental structure but are different in functions.
- Wings of birds and forelimbs of horse show homology because skeletal parts of their forelimbs are similar in structure and arrangement but have different functions.
Two different species can not live for long duration in the same niche or habitat. This law is[2002]- a)Allen's law
- b)Gause's hypothesis
- c)Dollo's rule
- d)Weisman's theory
Correct answer is option 'B'. Can you explain this answer?
Two different species can not live for long duration in the same niche or habitat. This law is
[2002]
a)
Allen's law
b)
Gause's hypothesis
c)
Dollo's rule
d)
Weisman's theory
|
|
Snehal Shah answered |
Gause's hypothesis states that two different competing species cannot coexist together for a long in the same niche, one has to get eliminated by the other competing species, if they do coexist, then they do so as a result of niche differentiation, i.e. differentiation of then realized niches.
Which of the following evidences does not favour the Lamarckian concept of inheritance of acquired characters?- a)Lack of pigment in cave-dwelling animals
- b)Melanisation in peppered moth
- c)Absence of limbs in snakes
- d)Presence of webbed toes in aquatic birds
Correct answer is option 'B'. Can you explain this answer?
Which of the following evidences does not favour the Lamarckian concept of inheritance of acquired characters?
a)
Lack of pigment in cave-dwelling animals
b)
Melanisation in peppered moth
c)
Absence of limbs in snakes
d)
Presence of webbed toes in aquatic birds
|
|
Priya Menon answered |
According to Lamarckism (proposed by Lamarck), whatever characters an individual acquires in its life time due to internal vital force, effect of environment, new needs, use and disuse of organs, they are inherited to next generations. This process continues and after several generations, the variations are accumulated upto such an extent that they give rise to new species. Melanisation in peppered moth favours Darwin's theory of natural selection.
Evolution of different species in a given area starting from a point and spreading to other geographical areas is known as- a)Migration
- b)Divergent evolution
- c)Adaptive radiation
- d)Natural selection
Correct answer is option 'C'. Can you explain this answer?
Evolution of different species in a given area starting from a point and spreading to other geographical areas is known as
a)
Migration
b)
Divergent evolution
c)
Adaptive radiation
d)
Natural selection
|
|
Mansi Deshpande answered |
Adaptive Radiation:
Adaptive radiation is the evolution of different species in a given area starting from a point and spreading to other geographical areas. It is a type of divergent evolution that occurs when a single ancestral species evolves into many different species to adapt to different ecological niches. The term "adaptive radiation" was coined by the American evolutionary biologist Henry Fairfield Osborn in 1897.
Factors that contribute to adaptive radiation:
1. Ecological opportunity: When new habitats or resources become available, organisms can exploit them and evolve to fill new niches.
2. Morphological innovation: Morphological innovation can allow organisms to exploit new resources or habitats.
3. Competition: Competition for resources can drive organisms to evolve different adaptations, leading to adaptive radiation.
Examples of adaptive radiation:
1. Darwin's finches: The Galápagos Islands are home to a number of different finch species that evolved from a common ancestor. Each species has a specialized beak that allows it to feed on different types of food.
2. Hawaiian honeycreepers: The Hawaiian Islands are home to a diverse group of birds known as honeycreepers. These birds evolved from a single ancestral species and have adapted to different ecological niches on the islands.
3. Australian marsupials: Australia is home to a number of different marsupial species that evolved from a common ancestor. These marsupials have adapted to different ecological niches, such as the kangaroo, koala, and Tasmanian devil.
Conclusion:
Adaptive radiation is an important process in the evolution of new species. It allows organisms to adapt to new environments and resources and can lead to the development of new ecological niches. The study of adaptive radiation can provide insights into the mechanisms of evolution and the factors that contribute to biodiversity.
Adaptive radiation is the evolution of different species in a given area starting from a point and spreading to other geographical areas. It is a type of divergent evolution that occurs when a single ancestral species evolves into many different species to adapt to different ecological niches. The term "adaptive radiation" was coined by the American evolutionary biologist Henry Fairfield Osborn in 1897.
Factors that contribute to adaptive radiation:
1. Ecological opportunity: When new habitats or resources become available, organisms can exploit them and evolve to fill new niches.
2. Morphological innovation: Morphological innovation can allow organisms to exploit new resources or habitats.
3. Competition: Competition for resources can drive organisms to evolve different adaptations, leading to adaptive radiation.
Examples of adaptive radiation:
1. Darwin's finches: The Galápagos Islands are home to a number of different finch species that evolved from a common ancestor. Each species has a specialized beak that allows it to feed on different types of food.
2. Hawaiian honeycreepers: The Hawaiian Islands are home to a diverse group of birds known as honeycreepers. These birds evolved from a single ancestral species and have adapted to different ecological niches on the islands.
3. Australian marsupials: Australia is home to a number of different marsupial species that evolved from a common ancestor. These marsupials have adapted to different ecological niches, such as the kangaroo, koala, and Tasmanian devil.
Conclusion:
Adaptive radiation is an important process in the evolution of new species. It allows organisms to adapt to new environments and resources and can lead to the development of new ecological niches. The study of adaptive radiation can provide insights into the mechanisms of evolution and the factors that contribute to biodiversity.
In the developmental history of mammalian heart, it is observed that it passes through a two chambered fish like heart, three chambered frog like heart and finally four chambered stage
To which hypothesis can this above cited statement be approximated?- a)Lamarck's principle
- b)Mendelian principle
- c)Biogenetic law
- d)Hardy Weinberg law
Correct answer is option 'C'. Can you explain this answer?
In the developmental history of mammalian heart, it is observed that it passes through a two chambered fish like heart, three chambered frog like heart and finally four chambered stage
To which hypothesis can this above cited statement be approximated?
To which hypothesis can this above cited statement be approximated?
a)
Lamarck's principle
b)
Mendelian principle
c)
Biogenetic law
d)
Hardy Weinberg law
|
|
Vivek Patel answered |
Biogenetic law or Recapitulation theory was given by Ernst Haeckel in 1866. It states that 'ontogeny repeats phylogeny'. Ontogeny is the life history of an organism while phylogeny is the evolutionary history of the race of that organism. This means that an organism repeats its ancestral history during its development.
Random genetic drift in a population probably results from[2003]- a)small population size
- b)highly genetically variable individuals
- c)interbreeding within this population
- d)constant low mutation rate
Correct answer is option 'A'. Can you explain this answer?
Random genetic drift in a population probably results from
[2003]
a)
small population size
b)
highly genetically variable individuals
c)
interbreeding within this population
d)
constant low mutation rate
|
|
Ritika Khanna answered |
Genetic drifts occurs only in small isolated population.
What did Charles Darwin conclude from his observations during his voyage on the H.M.S. Beagle?- a)All species were created simultaneously and remain unchanged.
- b)Existing living forms share similarities with life forms from millions of years ago and have evolved gradually.
- c)The earth is only a few thousand years old.
- d)Natural selection does not play a role in evolution.
Correct answer is option 'B'. Can you explain this answer?
a)
All species were created simultaneously and remain unchanged.
b)
Existing living forms share similarities with life forms from millions of years ago and have evolved gradually.
c)
The earth is only a few thousand years old.
d)
Natural selection does not play a role in evolution.
|
|
Shraddha Pillai answered |
Darwin's Observations on the H.M.S. Beagle
Charles Darwin's voyage on the H.M.S. Beagle (1831-1836) was a pivotal moment in the development of his theory of evolution. His extensive observations led him to conclude that:
Evolutionary Change
- Darwin noted that various species exhibited adaptations to their environments, suggesting they were not static but rather dynamic.
- He observed diverse life forms in different geographical locations, particularly in the Galápagos Islands, where he found unique species that were closely related to mainland species but adapted to their specific habitats.
Common Ancestry
- The similarities between species suggested that they shared common ancestors, indicating that life forms have evolved over millions of years through gradual changes.
- Fossils he examined showed a progression of life forms, supporting the idea that living organisms have evolved from earlier ones.
Natural Selection
- Darwin proposed that natural selection is a mechanism driving evolution, where individuals with advantageous traits are more likely to survive and reproduce.
- This led to the gradual adaptation of species over time, as those traits become more common in a population.
Conclusion
- The conclusion that existing living forms share similarities with ancient life forms and have evolved gradually encapsulates the essence of Darwin’s findings.
- This perspective laid the groundwork for modern evolutionary biology, highlighting the interconnectedness of life and the processes that shape it.
In summary, Darwin’s observations during his voyage led him to understand that species evolve over time, influenced by their environment and through natural selection, fundamentally reshaping our understanding of life on Earth.
Charles Darwin's voyage on the H.M.S. Beagle (1831-1836) was a pivotal moment in the development of his theory of evolution. His extensive observations led him to conclude that:
Evolutionary Change
- Darwin noted that various species exhibited adaptations to their environments, suggesting they were not static but rather dynamic.
- He observed diverse life forms in different geographical locations, particularly in the Galápagos Islands, where he found unique species that were closely related to mainland species but adapted to their specific habitats.
Common Ancestry
- The similarities between species suggested that they shared common ancestors, indicating that life forms have evolved over millions of years through gradual changes.
- Fossils he examined showed a progression of life forms, supporting the idea that living organisms have evolved from earlier ones.
Natural Selection
- Darwin proposed that natural selection is a mechanism driving evolution, where individuals with advantageous traits are more likely to survive and reproduce.
- This led to the gradual adaptation of species over time, as those traits become more common in a population.
Conclusion
- The conclusion that existing living forms share similarities with ancient life forms and have evolved gradually encapsulates the essence of Darwin’s findings.
- This perspective laid the groundwork for modern evolutionary biology, highlighting the interconnectedness of life and the processes that shape it.
In summary, Darwin’s observations during his voyage led him to understand that species evolve over time, influenced by their environment and through natural selection, fundamentally reshaping our understanding of life on Earth.
Assertion: The earliest organisms that appeared on the earth were non-green and presumably anaerobes.Reason: The first autotrophic organisms were the chemo-autotrophs that never released oxygen.- a)Both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
- b)Assertion is true statement but Reason is false
- c)Both Assertion and Reason are false statements
- d)Both Assertion and Reason are true and the Reason is not the correct explanation of the Assertion
Correct answer is option 'D'. Can you explain this answer?
Assertion: The earliest organisms that appeared on the earth were non-green and presumably anaerobes.
Reason: The first autotrophic organisms were the chemo-autotrophs that never released oxygen.
a)
Both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
b)
Assertion is true statement but Reason is false
c)
Both Assertion and Reason are false statements
d)
Both Assertion and Reason are true and the Reason is not the correct explanation of the Assertion
|
|
Gaurav Kumar answered |
The earliest organisms that appeared on the earth were non-green and presumably anaerobes. The first autotrophic organisms were the chemo-autotrophs that never released oxygen. Both the statements are correct but reason does not explain the assertion.
Common origin of man and chimpanzee is best shown by- a)Chromosomes
- b)Cranial capacity
- c)Dental formula
- d)Binocular vision
Correct answer is option 'A'. Can you explain this answer?
Common origin of man and chimpanzee is best shown by
a)
Chromosomes
b)
Cranial capacity
c)
Dental formula
d)
Binocular vision
|
Rachana Rachana answered |
From ramapithicus to homosapiens all have 46 chromosomes except the person who suffers from down's syndrome and klintifer syndrome
Read the following statements carefully and select the correct ones
(i) Alfred Wallace, a naturalist who worked in Malay Archipelago had also come to similar conclusions as Darwin around the same time
(ii) August Weismann by careful experimentation demonstrated that life comes only from pre-existing life.
(iii) The organs which have the same fundamental structure but are different in functions are called homologous organs
(iv) Rate of appearance' of new. form is inversely proportional to life span of organism- a)(i) and (iii)
- b)(i) and (ii)
- c)(ii) and (iv)
- d)(iii) and (iv)
Correct answer is option 'A'. Can you explain this answer?
Read the following statements carefully and select the correct ones
(i) Alfred Wallace, a naturalist who worked in Malay Archipelago had also come to similar conclusions as Darwin around the same time
(ii) August Weismann by careful experimentation demonstrated that life comes only from pre-existing life.
(iii) The organs which have the same fundamental structure but are different in functions are called homologous organs
(iv) Rate of appearance' of new. form is inversely proportional to life span of organism
(i) Alfred Wallace, a naturalist who worked in Malay Archipelago had also come to similar conclusions as Darwin around the same time
(ii) August Weismann by careful experimentation demonstrated that life comes only from pre-existing life.
(iii) The organs which have the same fundamental structure but are different in functions are called homologous organs
(iv) Rate of appearance' of new. form is inversely proportional to life span of organism
a)
(i) and (iii)
b)
(i) and (ii)
c)
(ii) and (iv)
d)
(iii) and (iv)
|
|
Meera Singh answered |
Louis Pasteur by careful experimentation demonstrated that life comes only from pre-existing life. Rate of appearance of new forms is directly proportional to life span of organism. Microbes that divide fast evolve fast. For same process to occur in fish or fowl will take million of years.
Which one of the following phenomena supports Darwin's concept of natural selection in organic evolution?- a)Development of transgenic animals
- b)Production of 'Dolly', the sheep by cloning
- c)Prevalence of pesticide resistant insects
- d)Development of organs from 'stem cells' for organ transplantation
Correct answer is option 'C'. Can you explain this answer?
Which one of the following phenomena supports Darwin's concept of natural selection in organic evolution?
a)
Development of transgenic animals
b)
Production of 'Dolly', the sheep by cloning
c)
Prevalence of pesticide resistant insects
d)
Development of organs from 'stem cells' for organ transplantation
|
|
Vivek Patel answered |
Prevalence of pesticide resistant insects supports natural selection theory, e.g., DDT was thought to be an effective insecticide against household pests (like mosquitoes, houseflies, body lice, etc.) in 1945. But, within 2 to 3 years of its introduction, new DDT resistant mosquitoes appeared in the population. These mutant strains, soon became well established in the population by natural selection and thus replaced the original DDT - sensitive mosquitoes.
Darwinism explains all the following except- a)off spring with better traits that over come competition are best suited for the environment
- b)variations may or may not be inherited from parents to offspring through genes
- c)within each species, there are variations
- d)organisms tend to produce more number of offspring than can survive
Correct answer is option 'B'. Can you explain this answer?
Darwinism explains all the following except
a)
off spring with better traits that over come competition are best suited for the environment
b)
variations may or may not be inherited from parents to offspring through genes
c)
within each species, there are variations
d)
organisms tend to produce more number of offspring than can survive
|
|
Preeti Iyer answered |
The main drawback of Darwinism is lack of knowledge of heredity. Darwin's theory could not explain the inheritance of variations from parents to off springs through genes.
Which one of the following describes correctly the homologous structures?- a)Organs with anatomical similarities, but performing different functions
- b)Organs with anatomical dissimilarities, but performing same function
- c)Organs that have no function now, but had important function in ancestors
- d)Organs appearing only in embryonic stage and disappearing later in the adult
Correct answer is option 'A'. Can you explain this answer?
Which one of the following describes correctly the homologous structures?
a)
Organs with anatomical similarities, but performing different functions
b)
Organs with anatomical dissimilarities, but performing same function
c)
Organs that have no function now, but had important function in ancestors
d)
Organs appearing only in embryonic stage and disappearing later in the adult
|
|
Meera Singh answered |
Homologous organs have a common origin and are built on the same basic pattern but perform different functions and are modified accordingly.
Jurassic period belongs to the ______ era.- a)Cenozoic
- b)Mesozoic
- c)Palaeozoic
- d)Proterozoic
Correct answer is option 'B'. Can you explain this answer?
Jurassic period belongs to the ______ era.
a)
Cenozoic
b)
Mesozoic
c)
Palaeozoic
d)
Proterozoic
|
Jyoti Sengupta answered |
The Jurassic Period was the second section of the Mesozoic Era. It happened from 199.6 to 145.5 million years back, after the Triassic Period and going before the Cretaceous Period.
Refer the given statements and select the correct one
(i) Fossils are remains of hard parts of life forms in Rocks
(ii) A study of fossils in different sedimentary layers indicates the geological period in which they live.
(iii) Radio isotopen are often used to determine the age of the fossils
(iv) Study of fossils is called paleontology- a)(i), (ii), (iii) and (iv)
- b)(ii) and (iv)
- c)(i), (iii) and (iv)
- d)None of these
Correct answer is option 'A'. Can you explain this answer?
Refer the given statements and select the correct one
(i) Fossils are remains of hard parts of life forms in Rocks
(ii) A study of fossils in different sedimentary layers indicates the geological period in which they live.
(iii) Radio isotopen are often used to determine the age of the fossils
(iv) Study of fossils is called paleontology
(i) Fossils are remains of hard parts of life forms in Rocks
(ii) A study of fossils in different sedimentary layers indicates the geological period in which they live.
(iii) Radio isotopen are often used to determine the age of the fossils
(iv) Study of fossils is called paleontology
a)
(i), (ii), (iii) and (iv)
b)
(ii) and (iv)
c)
(i), (iii) and (iv)
d)
None of these
|
Suresh Iyer answered |
The fossils can be defined as remains of impressions of the hard parts of the past life-forms in the strata of the earth. Fossils provide one of the most acceptable evidences in support of evolution, because we can study the evolutionary past of individuals in the form of their fossils. The study of fossils is known as paleontology. The evidence of evolution based on the knowledge of fossils is called paleontological evidence. Living organisms living in various ages and entombed in various starta of rocks provide concrete clues to the variety of life that existed in the past.
Age of the fossils can be determined by three methods: (i) Radioactive clock method (II) Radioactive carbon method and (iii) Potassium Organ method.
Age of the fossils can be determined by three methods: (i) Radioactive clock method (II) Radioactive carbon method and (iii) Potassium Organ method.
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