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All questions of Biological Evidence of Evolution for Grade 8 Exam
Which of the following orgn in man is not vestigial[CPMT 801]- a)Vermiform appendix
- b)Nictitating membrane
- c)Ear muscles
- d)Epiglottis
Correct answer is option 'D'. Can you explain this answer?
Which of the following orgn in man is not vestigial
[CPMT 801]
a)
Vermiform appendix
b)
Nictitating membrane
c)
Ear muscles
d)
Epiglottis
|
Aditi Priya answered |
Bcoz epiglottis helps in obstructing the entry of bolous into the trachea
Which of the following has homologous organs :[NCERT 78]- a)Hands of man, monkey and kangaroo and trunk of elephant
- b)Wings of insects, birds and bats
- c)Hindi limbs of grasshopper,horse and bat
- d)Mouthparts of cockroach, mosquito and honey bee
Correct answer is option 'D'. Can you explain this answer?
Which of the following has homologous organs :
[NCERT 78]
a)
Hands of man, monkey and kangaroo and trunk of elephant
b)
Wings of insects, birds and bats
c)
Hindi limbs of grasshopper,horse and bat
d)
Mouthparts of cockroach, mosquito and honey bee
|
Preeti Iyer answered |
The insects the mouth parts comprise labrum,mandibles and maxilla (representing similar origin and structure) but they have different functions.
Function of mouth in-
Cockroaches - biting and chewing
Honey bee - chewing and lapping
Mosquito - piercing and sucking.
Evidently,the same structure is developed along different divergent evolution and these structures are Homologous.
Function of mouth in-
Cockroaches - biting and chewing
Honey bee - chewing and lapping
Mosquito - piercing and sucking.
Evidently,the same structure is developed along different divergent evolution and these structures are Homologous.
If a particular animal hs shelled eggs, hair and teats of the bodyand has cloaca, it may be a connecting link between- a)Reptiles and birds
- b)Birds and mammals
- c)Reptiles and mammals
- d)None of them
Correct answer is option 'C'. Can you explain this answer?
If a particular animal hs shelled eggs, hair and teats of the bodyand has cloaca, it may be a connecting link between
a)
Reptiles and birds
b)
Birds and mammals
c)
Reptiles and mammals
d)
None of them
|
Suresh Iyer answered |
Lycaenops was a mammal-like reptile. It is considered a missing link between reptiles and mammals. Laying shelled eggs is a characteristic of birds and reptiles. Having hair, teats on body and cloaca are characteristics of animals. So, particular animal has shelled eggs, hair and teats on the body and has cloaca, it may be a connecting link between reptiles and mammals. Thus, option C is correct and other options are wrong.
Which bird can not fly:[NCERT 77]- a)Stark
- b)penguins
- c)Duck
- d)Peacock
Correct answer is option 'B'. Can you explain this answer?
Which bird can not fly:
[NCERT 77]
a)
Stark
b)
penguins
c)
Duck
d)
Peacock
|
Palak Basu answered |
Penguins are birds that cannot fly, but are excellent swimmers, which is why they spend a lot of time in the water. Out of 18 penguin species, only 3 species live exclusively in Antarctica, while the rest are scattered in many places around the Southern Hemisphere
Life originated in which era : [CPMT 76]
- a)Proterozoic
- b)Mesozoic
- c)Precambrian
- d)Coenozoic
Correct answer is option 'C'. Can you explain this answer?
Life originated in which era : [CPMT 76]
a)
Proterozoic
b)
Mesozoic
c)
Precambrian
d)
Coenozoic
|
Sandy Naaz answered |
The earliest undisputed evidence of life on Earth dates at least from 3.5billion years ago, during the Eoarchean Era, after a geological crust started to solidify following the earlier molten Hadean Eon.
Connecting link between annelida and mollusca : - a)Cuttle fish
- b)Octopus
- c)Neopilina
- d)Nautilus
Correct answer is option 'C'. Can you explain this answer?
Connecting link between annelida and mollusca :
a)
Cuttle fish
b)
Octopus
c)
Neopilina
d)
Nautilus
|
|
Prisha Bajaj answered |
Neopilina is a connecting link between annelids and molluscans. It is the only segmented mollusc. It has a cup shaped shell like that of limpet. Its visceral mass is divided into five segments, each with a pair of shell muscles, gills, auricles, and nephidia.
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.
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.
Dinosaurs are : [BHU 83]- a)Primitive amphinians
- b)Extinct reptiles
- c)Giant mammals
- d) Primitive mammals
Correct answer is option 'B'. Can you explain this answer?
Dinosaurs are :
[BHU 83]
a)
Primitive amphinians
b)
Extinct reptiles
c)
Giant mammals
d)
Primitive mammals
|
|
Kaneez Fatima answered |
Dinosaurs went extinct about 65 million years ago (at the end of the Cretaceous Period), after living on Earth for about 165 million years.
Which of the following organs in man is vestigial : [CPMT 77]- a)Pinna
- b)Wisdom tooth
- c)Fossa ovalis
- d)Ileum
Correct answer is option 'B'. Can you explain this answer?
Which of the following organs in man is vestigial : [CPMT 77]
a)
Pinna
b)
Wisdom tooth
c)
Fossa ovalis
d)
Ileum
|
Surya answered |
Vestigial organs means evidence for the evolution.. so as per the given option...wisdom teeth is the vestigial organ...so the option B is correct...
Dinosaurs originated : [CPMT 86]- a)After evolution of mammals
- b)With mammals
- c)Much before mammals
- d)Before mammals and they formed them
Correct answer is option 'B'. Can you explain this answer?
Dinosaurs originated : [CPMT 86]
a)
After evolution of mammals
b)
With mammals
c)
Much before mammals
d)
Before mammals and they formed them
|
|
Siddiq Zayeda answered |
Mammals appeared on the earth long before the extinction of the dinosaurs; in fact, dinosaurs and mammals originated within 10 million years of each other, in the late Triassic about 200 million years ago.........
Homologous organs have :[MP PMT 01]- a)Similar origin and similar or dissimilar functions
- b)Dissimilar origin and structure
- c)Dissimilar origin and function
- d)Dissimilar origin and similar functions
Correct answer is option 'A'. Can you explain this answer?
Homologous organs have :
[MP PMT 01]
a)
Similar origin and similar or dissimilar functions
b)
Dissimilar origin and structure
c)
Dissimilar origin and function
d)
Dissimilar origin and similar functions
|
|
Afifa Aaliya answered |
Organs such as bats of wings, wings of birds, seals of flippers, arms of humans have common underlying anatomy. That was present in last common Ancestors. forelimbs are homologous organs. homology refers to the traits inherited by two different organisms from common ancestry. so it has similar origin and different or similar functions.
So option " A " is correct answer.
So option " A " is correct answer.
There are no life in which era :[CPMT 80]- a)Messozoic era
- b)Palaeozoic era
- c)Coenozoic era
- d)Azoic era
Correct answer is option 'D'. Can you explain this answer?
There are no life in which era :
[CPMT 80]
a)
Messozoic era
b)
Palaeozoic era
c)
Coenozoic era
d)
Azoic era
|
|
Ayeshashreya Mishra answered |
During Azoic era, the earth was with out plants and animals. The rock layers which were formed soon after azoic era contains the remains of limy sea plants.The word "Azoic" is derived from the Greek, a- meaning without and zoon meaning animal (or living being), it was first used to mean without life.....
An era ''age of birds and mammals'' is : [CPMT 93]- a)Mesozoic
- b)Palaecozoic
- c)Coenozoic
- d)Cretaceous
Correct answer is option 'C'. Can you explain this answer?
An era ''age of birds and mammals'' is : [CPMT 93]
a)
Mesozoic
b)
Palaecozoic
c)
Coenozoic
d)
Cretaceous
|
|
Afifa Aaliya answered |
The Cenozoic era is the most recent of the three major sub division of the animal history. The other two are the Mesozoic and Peliozoic eras. The Cenozoic era only about 65 million years. From the end of the Cretaceous period and the extension of non avian dinosaurs to the present. The Cenozoic is sometimes called as age of mammals because the largest land animals have been mammals during that time.
So option " C " is correct answer.
So option " C " is correct 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
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.
Evolution of birds and mammals occurred in : [CPMT 83]- a)Eocene and oligocene periods
- b)Silurian and Devonian periods
- c)Carboniferous and Permain epochs
- d)Jurasic period
Correct answer is option 'D'. Can you explain this answer?
Evolution of birds and mammals occurred in :
[CPMT 83]
a)
Eocene and oligocene periods
b)
Silurian and Devonian periods
c)
Carboniferous and Permain epochs
d)
Jurasic period
|
|
Baishali Joshi answered |
The evolution of birds and mammals occurred in Jurassic period. The earliest birds were derived from a clade of theropod dinosaurs named paraves. Mammals evolved 10 times faster in the middle of the Jurassic period.
If a starfish possess 6 arms instead of 5, it is an example of :[CPMT 84]- a)Variation
- b)Metamorphosis
- c)Biogenesis
- d)Evolution
Correct answer is option 'A'. Can you explain this answer?
If a starfish possess 6 arms instead of 5, it is an example of :
[CPMT 84]
a)
Variation
b)
Metamorphosis
c)
Biogenesis
d)
Evolution
|
|
Afifa Aaliya answered |
If a starfish possess 6 arms instead of 5 it's an example of variations. Because it is in difference between cells individual organisms of any species caused either genetic difference. Variations may show physical appearance, metabolism, fertility.., etc..,
So option " A " is correct answer.
So option " A " is correct answer.
The mesozoic era of earth is called the : [CPMT 84]- a)Age of amphibians
- b)Age of armoured fishes
- c)Age of primitive man
- d)Age of ruling reptiles
Correct answer is option 'D'. Can you explain this answer?
The mesozoic era of earth is called the : [CPMT 84]
a)
Age of amphibians
b)
Age of armoured fishes
c)
Age of primitive man
d)
Age of ruling reptiles
|
Yamuna Mani answered |
Mesozoic era or middle life era is the life diversified rapidly and giant reptiles,dinosaurs and other monstrous beads roamed the earth. so it is called as age of reptiles era.
Branch of biology which deals with fossils :[CPMT 75]- a)Ethology
- b)Ecology
- c)Palaeontology
- d)Ormitholgoy
Correct answer is option 'C'. Can you explain this answer?
Branch of biology which deals with fossils :
[CPMT 75]
a)
Ethology
b)
Ecology
c)
Palaeontology
d)
Ormitholgoy
|
Debolina Chopra answered |
Palaeontology is the branch of biology that deals with fossils. Fossils are the preserved remains or traces of ancient organisms that provide valuable information about the history of life on Earth. Palaeontologists study fossils to understand the evolution, diversity, and ecological interactions of organisms that lived in the past.
1. Definition of Palaeontology:
Palaeontology is the scientific study of fossils, including their formation, identification, classification, and interpretation. It combines elements of biology, geology, and paleoecology to reconstruct the ancient history of life on Earth.
2. Importance of Fossils:
Fossils are crucial evidence for understanding the evolutionary processes that have shaped life on our planet. They provide insights into the anatomy, behavior, and ecology of extinct organisms, as well as the past environments in which they lived. Fossils also help in dating rock layers, determining ancient climate conditions, and documenting the history of biodiversity.
3. Scope of Palaeontology:
Palaeontology covers a wide range of topics, including:
- Taxonomy: Classifying and identifying fossil organisms.
- Morphology: Studying the structure and form of fossil remains.
- Phylogeny: Reconstructing the evolutionary relationships between different species.
- Paleobiology: Understanding the biology and behavior of extinct organisms.
- Paleoecology: Investigating ancient ecosystems and their interactions.
- Biostratigraphy: Using fossils to date and correlate rock layers.
- Taphonomy: Examining the processes that lead to fossilization.
4. Methods and Techniques:
Palaeontologists use various methods and techniques to study fossils, including:
- Excavation: Careful removal of fossils from their geological context.
- Preparation: Cleaning and preserving fossil specimens for further analysis.
- Comparative Anatomy: Comparing fossil remains with living organisms to infer their characteristics.
- Microscopy: Examining fossil structures at a microscopic level.
- Radiometric Dating: Using radioactive isotopes to determine the age of rocks and fossils.
- CT Scanning: Non-destructive imaging of fossils to reveal internal structures.
In conclusion, palaeontology is a branch of biology that focuses on the study of fossils. It plays a crucial role in understanding the history of life on Earth, providing insights into evolution, biodiversity, and ancient ecosystems.
1. Definition of Palaeontology:
Palaeontology is the scientific study of fossils, including their formation, identification, classification, and interpretation. It combines elements of biology, geology, and paleoecology to reconstruct the ancient history of life on Earth.
2. Importance of Fossils:
Fossils are crucial evidence for understanding the evolutionary processes that have shaped life on our planet. They provide insights into the anatomy, behavior, and ecology of extinct organisms, as well as the past environments in which they lived. Fossils also help in dating rock layers, determining ancient climate conditions, and documenting the history of biodiversity.
3. Scope of Palaeontology:
Palaeontology covers a wide range of topics, including:
- Taxonomy: Classifying and identifying fossil organisms.
- Morphology: Studying the structure and form of fossil remains.
- Phylogeny: Reconstructing the evolutionary relationships between different species.
- Paleobiology: Understanding the biology and behavior of extinct organisms.
- Paleoecology: Investigating ancient ecosystems and their interactions.
- Biostratigraphy: Using fossils to date and correlate rock layers.
- Taphonomy: Examining the processes that lead to fossilization.
4. Methods and Techniques:
Palaeontologists use various methods and techniques to study fossils, including:
- Excavation: Careful removal of fossils from their geological context.
- Preparation: Cleaning and preserving fossil specimens for further analysis.
- Comparative Anatomy: Comparing fossil remains with living organisms to infer their characteristics.
- Microscopy: Examining fossil structures at a microscopic level.
- Radiometric Dating: Using radioactive isotopes to determine the age of rocks and fossils.
- CT Scanning: Non-destructive imaging of fossils to reveal internal structures.
In conclusion, palaeontology is a branch of biology that focuses on the study of fossils. It plays a crucial role in understanding the history of life on Earth, providing insights into evolution, biodiversity, and ancient ecosystems.
Galapagos islands are connected with which scientist : [BHU 80]- a)Wallace
- b)Lamarck
- c)Malthus
- d)Darwin
Correct answer is option 'D'. Can you explain this answer?
Galapagos islands are connected with which scientist :
[BHU 80]
a)
Wallace
b)
Lamarck
c)
Malthus
d)
Darwin
|
|
Nayanika Patel answered |
The name of Charles Darwin and his famous book The Origin of Species will forever be linked with the Galapagos Islands. Although he was only in the Galapagos for five weeks in 1835, it was the wildlife that he saw there that inspired him to develop his Theory of Evolution.
Wings of locust, pigeon, and bat are example of :[CPMT 84]- a)Vestigial organs
- b)Analogous organs
- c)Homologous organs
- d)Evolution
Correct answer is option 'B'. Can you explain this answer?
Wings of locust, pigeon, and bat are example of :
[CPMT 84]
a)
Vestigial organs
b)
Analogous organs
c)
Homologous organs
d)
Evolution
|
Jyoti Sengupta answered |
The organs which have different embryonic origin but perform same function are called as analogous organs, e.g., wings of bat and insects. The organs which have same embryonic origin but adapted to perform different functions are known as homologous organs, e.g., wing of bat and forelimb of humans.
Who was the first to explain recapitulatin theory :[CPMT 78, 80]- a)Weismann
- b)Muller and Haeckel
- c)Darwin
- d)Malthus
Correct answer is option 'B'. Can you explain this answer?
Who was the first to explain recapitulatin theory :
[CPMT 78, 80]
a)
Weismann
b)
Muller and Haeckel
c)
Darwin
d)
Malthus
|
|
Sandy Naaz answered |
The theory of recapitulation, also called the biogenetic law or embryological parallelism—often expressed using Ernst Haeckel's phrase "ontogeny recapitulates phylogeny"—is a historical hypothesis that the development of the embryo of an animal, from fertilization to gestation or hatching (ontogeny), goes through ...
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.
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.
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.
Which of the following sets do not have homologous organs : - a)Wings of mosquito and butterfly
- b)All of them
- c)Mouth parts of cockroach and butter fly
- d)Wings of butterfly and bird
Correct answer is option 'D'. Can you explain this answer?
Which of the following sets do not have homologous organs :
a)
Wings of mosquito and butterfly
b)
All of them
c)
Mouth parts of cockroach and butter fly
d)
Wings of butterfly and bird
|
Gundappa Karamadi answered |
Origin is different and function same
At what temperature was the flask maintained in Miller’s experiment?- a)900°C
- b)600°C
- c)700°C
- d)800°C
Correct answer is option 'D'. Can you explain this answer?
At what temperature was the flask maintained in Miller’s experiment?
a)
900°C
b)
600°C
c)
700°C
d)
800°C
|
|
Arpita Saha answered |
Temperature of the Flask in Miller's Experiment
Miller's experiment was conducted to simulate the conditions thought to be present on early Earth in order to investigate the origins of life. One of the key parameters in the experiment was the temperature at which the flask was maintained.
Correct Answer: d) 800°C
Explanation:
- Miller maintained the flask at a temperature of 800°C during the experiment.
- This high temperature was chosen to simulate the conditions of early Earth, where volcanic activity and high temperatures were prevalent.
- The heat provided the energy needed for the chemical reactions to occur in the experiment.
- At this temperature, the gases in the flask were subjected to electrical discharges to mimic lightning strikes, which were believed to be common in the early atmosphere.
- The experiment produced a variety of organic compounds, including amino acids, which are the building blocks of life.
- The results of Miller's experiment provided evidence that the basic building blocks of life could have formed spontaneously under the conditions present on early Earth.
By maintaining the flask at 800°C, Miller was able to create an environment that allowed for the formation of organic compounds essential for the origin of life.
Miller's experiment was conducted to simulate the conditions thought to be present on early Earth in order to investigate the origins of life. One of the key parameters in the experiment was the temperature at which the flask was maintained.
Correct Answer: d) 800°C
Explanation:
- Miller maintained the flask at a temperature of 800°C during the experiment.
- This high temperature was chosen to simulate the conditions of early Earth, where volcanic activity and high temperatures were prevalent.
- The heat provided the energy needed for the chemical reactions to occur in the experiment.
- At this temperature, the gases in the flask were subjected to electrical discharges to mimic lightning strikes, which were believed to be common in the early atmosphere.
- The experiment produced a variety of organic compounds, including amino acids, which are the building blocks of life.
- The results of Miller's experiment provided evidence that the basic building blocks of life could have formed spontaneously under the conditions present on early Earth.
By maintaining the flask at 800°C, Miller was able to create an environment that allowed for the formation of organic compounds essential for the origin of life.
Primitive atmosphere was made up of the mixture of : [CPMT 81]- a)Oxygen, ammonia, methane, water
- b)Hydrogen, ammonia, methane, oxygen
- c)Hydrogen, steam, methane, ammonia
- d)Oxygen, methane, water, nickel
Correct answer is option 'C'. Can you explain this answer?
Primitive atmosphere was made up of the mixture of :
[CPMT 81]
a)
Oxygen, ammonia, methane, water
b)
Hydrogen, ammonia, methane, oxygen
c)
Hydrogen, steam, methane, ammonia
d)
Oxygen, methane, water, nickel
|
Anirudh Datta answered |
The primitive atmosphere of earth was reducing atmosphere with little or no oxygen but was rich in water vapour, carbon monoxide, carbon dioxide, nitrogen and hydrogen. Thus, oxygen was not present in primitive atmosphere. The high temperature, UV light and lightening provided energy for chemical reactions between hydrogen and free oxygen, nitrogen and carbon to form, ammonia, methane and cyanides. Owing to the high temperature of earth, water was present in form of superheated steam and ammonia, methane and cyanides were present in gaseous form.
Therefore, the correct answer is option C.
Evolution is a ______ process.- a)quick
- b)stochastic
- c)slow
- d)fast
Correct answer is option 'B'. Can you explain this answer?
Evolution is a ______ process.
a)
quick
b)
stochastic
c)
slow
d)
fast
|
Top Rankers answered |
- Evolution is a stochastic process, which means that it is focusing on chance mutations.
- Based on determinism, evolution is not a direct process.
- It is also based on events that occurs in a chance.
Which of the following is true?- a)Wings of birds and insects are homologous organs.
- b)Human hands and wings of birds are analogous organs.
- c)Human hands and wings of bats are analogous organs.
- d)Flipper of seal and wings of birds are homologous organs.
Correct answer is option 'D'. Can you explain this answer?
Which of the following is true?
a)
Wings of birds and insects are homologous organs.
b)
Human hands and wings of birds are analogous organs.
c)
Human hands and wings of bats are analogous organs.
d)
Flipper of seal and wings of birds are homologous organs.
|
|
Suresh Iyer answered |
Flipper of seal and wing of birds are modified forelimbs, thus, have same fundamental structure but have different functions. Flippers are meant for swimming and wings are meant for flying. Therefore, these organs are homologous oroans.
Industrial melanism is an example of -- a)Mutation
- b)Natural selection
- c)Neo Darwinism
- d)Neo Lamarckism
Correct answer is option 'B'. Can you explain this answer?
Industrial melanism is an example of -
a)
Mutation
b)
Natural selection
c)
Neo Darwinism
d)
Neo Lamarckism
|
EduRev NEET answered |
Natural selection is the most widely accepted theory concerning the principal causal mechanism of evolutionary change profounded by Charles Darwin and Alfred Russel Wallace. It results from the differential reproduction (some members of a population produce abundant offspring, some only a few and still others none), one phenotype as compared with other phenotypes in the same population. This determines the relative share of different genotypes which individuals possess and propagate in a population. Industrial melanism supports evolution by natural selection. It is an adaptation where the moths living in the industrial areas developed melanin pigments to match their bodies to the tree trunks.
Earliest fossil form in the phylogeny of horse is : [CBSE 94]- a)Mesohippus
- b)Equus
- c)Eohippus
- d)Merychippus
Correct answer is option 'C'. Can you explain this answer?
Earliest fossil form in the phylogeny of horse is : [CBSE 94]
a)
Mesohippus
b)
Equus
c)
Eohippus
d)
Merychippus
|
|
Tejas Chakraborty answered |
Hoofed animals like-horse orginated in Eocene epoch in North America. First horse-like animals from which the modern horse Equus evolved was Hyracotherium (old name Eohippus). The fossil record is most complete in horse.
Fossils are dated by : [CPMT 74, AFMC 80]- a)Amount of calcium residue
- b)Amount of radioactive carbon compound
- c)Association with other mammlas
- d)Structure of bones
Correct answer is option 'B'. Can you explain this answer?
Fossils are dated by :
[CPMT 74, AFMC 80]
a)
Amount of calcium residue
b)
Amount of radioactive carbon compound
c)
Association with other mammlas
d)
Structure of bones
|
Prahlad Pai answered |
It is called carbon dating
used carbon isotope C14
used carbon isotope C14
Who demonstrated that life originated from pre-existing cells?- a)Louis Pasteur
- b)Hugo de Vries
- c)Charles Darwin
- d)Stanley Miller
Correct answer is option 'A'. Can you explain this answer?
Who demonstrated that life originated from pre-existing cells?
a)
Louis Pasteur
b)
Hugo de Vries
c)
Charles Darwin
d)
Stanley Miller
|
|
EduRev NEET answered |
- Louis Pasteur in his swan neck flask experiment, found out that life originated from pre-existing life.
- He prepared sterilized syrup of sugar and later killed yeast by boiling them in flasks.
Theory of 'Saltations' was given by - a)G Mendel
- b)Hugo de Vries
- c)J B S Haldane
- d)H J Miller
Correct answer is option 'B'. Can you explain this answer?
Theory of 'Saltations' was given by
a)
G Mendel
b)
Hugo de Vries
c)
J B S Haldane
d)
H J Miller
|
|
Shanaya Basak answered |
Introduction to the Theory of Saltations
The Theory of Saltations, proposed by Hugo de Vries, significantly contributed to the understanding of evolution and genetic variation. De Vries introduced this concept in the early 20th century, challenging the gradualism of Darwinian evolution.
Key Concepts of Saltation Theory
- Definition of Saltation:
Saltation refers to sudden and large evolutionary changes, as opposed to gradual changes over time.
- Mutation as a Driver:
De Vries emphasized mutations as the primary mechanism of saltation, suggesting that new species can arise rapidly due to significant genetic changes.
- Experiments with Evening Primrose:
De Vries conducted experiments on *Oenothera lamarckiana* (evening primrose) to observe how mutations could lead to new forms, supporting his theory.
Impact on Evolutionary Biology
- Revolutionized Understanding:
Saltation theory provided an alternative view to Darwin's gradualism, leading to discussions about the pace of evolutionary change.
- Foundation for Modern Genetics:
De Vries' work laid the groundwork for the field of genetics, influencing later researchers like J.B.S. Haldane and others who explored genetic variations in populations.
Conclusion
Hugo de Vries' Theory of Saltations highlights the importance of mutations in the evolutionary process, offering a perspective that complements traditional evolutionary theories. Understanding this theory is crucial for comprehending the mechanisms of evolution, especially in the context of genetic diversity and speciation.
The Theory of Saltations, proposed by Hugo de Vries, significantly contributed to the understanding of evolution and genetic variation. De Vries introduced this concept in the early 20th century, challenging the gradualism of Darwinian evolution.
Key Concepts of Saltation Theory
- Definition of Saltation:
Saltation refers to sudden and large evolutionary changes, as opposed to gradual changes over time.
- Mutation as a Driver:
De Vries emphasized mutations as the primary mechanism of saltation, suggesting that new species can arise rapidly due to significant genetic changes.
- Experiments with Evening Primrose:
De Vries conducted experiments on *Oenothera lamarckiana* (evening primrose) to observe how mutations could lead to new forms, supporting his theory.
Impact on Evolutionary Biology
- Revolutionized Understanding:
Saltation theory provided an alternative view to Darwin's gradualism, leading to discussions about the pace of evolutionary change.
- Foundation for Modern Genetics:
De Vries' work laid the groundwork for the field of genetics, influencing later researchers like J.B.S. Haldane and others who explored genetic variations in populations.
Conclusion
Hugo de Vries' Theory of Saltations highlights the importance of mutations in the evolutionary process, offering a perspective that complements traditional evolutionary theories. Understanding this theory is crucial for comprehending the mechanisms of evolution, especially in the context of genetic diversity and speciation.
Fossil X can be considered to have evolved earlier than fossil Y if : [CPMT 93]- a)Y has vestigial structures that are homologous to functional structures in fossil X
- b)Y is structurally more complex than fossil X
- c)Y is in better state of preservation than X
- d)X is found in lower stratum of undisturbed sedimentary rock than Y
Correct answer is option 'A'. Can you explain this answer?
Fossil X can be considered to have evolved earlier than fossil Y if : [CPMT 93]
a)
Y has vestigial structures that are homologous to functional structures in fossil X
b)
Y is structurally more complex than fossil X
c)
Y is in better state of preservation than X
d)
X is found in lower stratum of undisturbed sedimentary rock than Y
|
|
Pooja Mehta answered |
Fossil 'X' can be considered to have evolved earlier than fossil 'Y' if fossil 'X' is found in lower stratum of undisturbed sedimentary rock than 'Y'. Fossils are preserved forms of living organisms that really existed on earth. Presence of 'X' in lower stratum indicates that it existed of 'X' in lower stratum indicates that it existed much before than 'Y'.
Prototheria have developd from [BHU 80, CPMT 77]- a)Birds
- b)Eutheria
- c)Amphibia
- d)Reptilia
Correct answer is option 'D'. Can you explain this answer?
Prototheria have developd from [BHU 80, CPMT 77]
a)
Birds
b)
Eutheria
c)
Amphibia
d)
Reptilia
|
Naina Bansal answered |
Prototherians appears to be a combination of reptiles,birds and true mammals. The ancestors of this group are Eutherians and Metatherian. Prototherians split from their ancestors before these become the placental mammals and hence, formed a separate group. They adapted to harsher and diverse groups.
According to the Hardy-Weinberg principle, what condition indicates that evolution is occurring in a population?- a)Allele frequencies remain constant across generations.
- b)The frequency of homozygous dominant individuals equals p².
- c)Allele frequencies change due to factors like genetic drift or natural selection.
- d)The sum of p² + 2pq + q² equals 1 in all scenarios.
Correct answer is option 'C'. Can you explain this answer?
a)
Allele frequencies remain constant across generations.
b)
The frequency of homozygous dominant individuals equals p².
c)
Allele frequencies change due to factors like genetic drift or natural selection.
d)
The sum of p² + 2pq + q² equals 1 in all scenarios.
|
|
Nitya Menon answered |
Understanding the Hardy-Weinberg Principle
According to the Hardy-Weinberg principle, a population is in genetic equilibrium when specific conditions are met, resulting in constant allele frequencies across generations. However, if these conditions are violated, evolution is indicated.
Key Indicators of Evolution
- Allele Frequencies Change: The correct answer is option 'C', which states that allele frequencies change due to factors like genetic drift or natural selection. This change signifies that evolutionary processes are at work.
- Genetic Drift: Random fluctuations in allele frequencies can lead to significant changes in small populations, potentially resulting in evolution.
- Natural Selection: Differential survival and reproduction of individuals based on their phenotypic traits can alter allele frequencies over time, driving evolutionary change.
Other Options Explained
- Option A: This suggests that allele frequencies remain constant, which indicates that evolution is not occurring. This aligns with the Hardy-Weinberg equilibrium.
- Option B: The frequency of homozygous dominant individuals being equal to p² is a specific outcome of the Hardy-Weinberg equation but does not indicate evolution.
- Option D: The sum of p² + 2pq + q² equals 1 under Hardy-Weinberg equilibrium. This condition being satisfied does not imply evolution is occurring.
Conclusion
In summary, option 'C' accurately reflects that changes in allele frequencies due to mechanisms such as natural selection or genetic drift signify that evolution is occurring in a population. Understanding these concepts is crucial for interpreting population genetics and evolutionary biology.
According to the Hardy-Weinberg principle, a population is in genetic equilibrium when specific conditions are met, resulting in constant allele frequencies across generations. However, if these conditions are violated, evolution is indicated.
Key Indicators of Evolution
- Allele Frequencies Change: The correct answer is option 'C', which states that allele frequencies change due to factors like genetic drift or natural selection. This change signifies that evolutionary processes are at work.
- Genetic Drift: Random fluctuations in allele frequencies can lead to significant changes in small populations, potentially resulting in evolution.
- Natural Selection: Differential survival and reproduction of individuals based on their phenotypic traits can alter allele frequencies over time, driving evolutionary change.
Other Options Explained
- Option A: This suggests that allele frequencies remain constant, which indicates that evolution is not occurring. This aligns with the Hardy-Weinberg equilibrium.
- Option B: The frequency of homozygous dominant individuals being equal to p² is a specific outcome of the Hardy-Weinberg equation but does not indicate evolution.
- Option D: The sum of p² + 2pq + q² equals 1 under Hardy-Weinberg equilibrium. This condition being satisfied does not imply evolution is occurring.
Conclusion
In summary, option 'C' accurately reflects that changes in allele frequencies due to mechanisms such as natural selection or genetic drift signify that evolution is occurring in a population. Understanding these concepts is crucial for interpreting population genetics and evolutionary biology.
What observation about moths in England supports the concept of natural selection?- a)White-winged moths increased in number after industrialization.
- b)Dark-winged moths became more common in polluted areas after industrialization.
- c)Moth populations remained unchanged regardless of environmental conditions.
- d)Predators preferred dark-winged moths in all conditions.
Correct answer is option 'B'. Can you explain this answer?
a)
White-winged moths increased in number after industrialization.
b)
Dark-winged moths became more common in polluted areas after industrialization.
c)
Moth populations remained unchanged regardless of environmental conditions.
d)
Predators preferred dark-winged moths in all conditions.
|
|
Dipanjan Malik answered |
Understanding Natural Selection in Moths
Natural selection is a key mechanism of evolution, wherein organisms better adapted to their environment tend to survive and produce more offspring. The case of moths in England, particularly during the Industrial Revolution, provides a classic example of this principle in action.
Observations of Moth Populations
- Industrialization Impact: During the Industrial Revolution, pollution led to darker soot covering trees and buildings in many areas. This created an environment where lighter-colored moths were more visible to predators.
- Dark-Winged Moths' Advantage: As a result of the polluted environment, dark-winged moths had a survival advantage. Their coloration allowed them to blend in better with the soot-covered surfaces, making it harder for predators, such as birds, to spot them.
- Increased Population of Dark-Winged Moths: Over time, the population of dark-winged moths increased significantly in polluted areas, while lighter-colored moths saw a decline. This shift illustrates how environmental changes can drive natural selection.
Conclusion: Evidence of Natural Selection
The rise of dark-winged moths in polluted areas effectively supports the concept of natural selection. The key points are:
- Survival of the Fittest: Dark-winged moths survived at higher rates due to their advantageous coloration.
- Adaptation to Environment: The change in population demonstrates how species can adapt to their changing surroundings, a hallmark of natural selection.
This example highlights the dynamic relationship between organisms and their environment, emphasizing the role of natural selection in shaping species over time.
Natural selection is a key mechanism of evolution, wherein organisms better adapted to their environment tend to survive and produce more offspring. The case of moths in England, particularly during the Industrial Revolution, provides a classic example of this principle in action.
Observations of Moth Populations
- Industrialization Impact: During the Industrial Revolution, pollution led to darker soot covering trees and buildings in many areas. This created an environment where lighter-colored moths were more visible to predators.
- Dark-Winged Moths' Advantage: As a result of the polluted environment, dark-winged moths had a survival advantage. Their coloration allowed them to blend in better with the soot-covered surfaces, making it harder for predators, such as birds, to spot them.
- Increased Population of Dark-Winged Moths: Over time, the population of dark-winged moths increased significantly in polluted areas, while lighter-colored moths saw a decline. This shift illustrates how environmental changes can drive natural selection.
Conclusion: Evidence of Natural Selection
The rise of dark-winged moths in polluted areas effectively supports the concept of natural selection. The key points are:
- Survival of the Fittest: Dark-winged moths survived at higher rates due to their advantageous coloration.
- Adaptation to Environment: The change in population demonstrates how species can adapt to their changing surroundings, a hallmark of natural selection.
This example highlights the dynamic relationship between organisms and their environment, emphasizing the role of natural selection in shaping species over time.
A population will not exist in Hardy-Weinberg equilibrium if- a)there are no mutations
- b)individuals mate selectively
- c)the population is large
- d)there is no migration
Correct answer is option 'B'. Can you explain this answer?
A population will not exist in Hardy-Weinberg equilibrium if
a)
there are no mutations
b)
individuals mate selectively
c)
the population is large
d)
there is no migration
|
Lead Academy answered |
The theory of Hardy- Weinberg equilibrium states that in the absence of disturbance on the level of genetic structure, a population’s existance will not continue. Thus mating should be in a random way.
In evolution, the studies can be made at molecular level. For example, the proteins present in the blood of man and ape are similar. The base sequence in nucleic acids and amino acids sequence in proteins of related organism is alike. These are the examples which are specifically referred to in- a)convergent evolution
- b)molecular analogy
- c)molecular homology
- d)homoplastic appearance
Correct answer is option 'C'. Can you explain this answer?
In evolution, the studies can be made at molecular level. For example, the proteins present in the blood of man and ape are similar. The base sequence in nucleic acids and amino acids sequence in proteins of related organism is alike. These are the examples which are specifically referred to in
a)
convergent evolution
b)
molecular analogy
c)
molecular homology
d)
homoplastic appearance
|
|
Siddharth Iyer answered |
The Concept of Molecular Homology
Molecular homology refers to the similarities in molecular structures, such as nucleic acids and proteins, that indicate a common evolutionary ancestor. This concept is fundamental in understanding evolutionary relationships among species.
Understanding Molecular Homology
- Shared Genetic Material:
- Organisms that share a common ancestor will often have similar DNA sequences. For example, humans and apes exhibit significant similarities in their DNA, which can be traced back to a shared evolutionary lineage.
- Protein Similarities:
- The amino acid sequences of proteins in related organisms also show remarkable similarities. This is evident in blood proteins, where humans and apes have closely related structures, reflecting their evolutionary connection.
Importance of Molecular Homology
- Evolutionary Relationships:
- Molecular homology provides evidence for the evolutionary relationships between species. The closer the genetic similarity, the more likely the organisms are related through common ancestry.
- Phylogenetic Analysis:
- Scientists utilize molecular homology in constructing phylogenetic trees, which visually represent the evolutionary pathways and connections among different species.
Distinction from Other Concepts
- Convergent Evolution:
- Unlike molecular homology, convergent evolution refers to unrelated species developing similar traits due to similar environmental pressures, not shared ancestry.
- Molecular Analogy and Homoplastic Appearance:
- These terms often refer to similar features arising independently in different species, rather than from a common ancestor, distinguishing them from molecular homology.
In summary, molecular homology plays a crucial role in the study of evolution, providing insights into the genetic and protein similarities that highlight the connections among various organisms.
Molecular homology refers to the similarities in molecular structures, such as nucleic acids and proteins, that indicate a common evolutionary ancestor. This concept is fundamental in understanding evolutionary relationships among species.
Understanding Molecular Homology
- Shared Genetic Material:
- Organisms that share a common ancestor will often have similar DNA sequences. For example, humans and apes exhibit significant similarities in their DNA, which can be traced back to a shared evolutionary lineage.
- Protein Similarities:
- The amino acid sequences of proteins in related organisms also show remarkable similarities. This is evident in blood proteins, where humans and apes have closely related structures, reflecting their evolutionary connection.
Importance of Molecular Homology
- Evolutionary Relationships:
- Molecular homology provides evidence for the evolutionary relationships between species. The closer the genetic similarity, the more likely the organisms are related through common ancestry.
- Phylogenetic Analysis:
- Scientists utilize molecular homology in constructing phylogenetic trees, which visually represent the evolutionary pathways and connections among different species.
Distinction from Other Concepts
- Convergent Evolution:
- Unlike molecular homology, convergent evolution refers to unrelated species developing similar traits due to similar environmental pressures, not shared ancestry.
- Molecular Analogy and Homoplastic Appearance:
- These terms often refer to similar features arising independently in different species, rather than from a common ancestor, distinguishing them from molecular homology.
In summary, molecular homology plays a crucial role in the study of evolution, providing insights into the genetic and protein similarities that highlight the connections among various organisms.
Change with desent is the basis of which theory :- a)Recapitulation theory
- b)Oparin's theory
- c)Theory of organic evolution
- d)Cell theory
Correct answer is option 'C'. Can you explain this answer?
Change with desent is the basis of which theory :
a)
Recapitulation theory
b)
Oparin's theory
c)
Theory of organic evolution
d)
Cell theory
|
|
Raza Great answered |
The evolutionary term descent with modification is most often associated with human evolution, but it is actually a more general term than that would suggest. Simply put, descent with modification means that traits are passed down from generation to generation and sometimes undergo changes or modifications over time. These changes may be caused by natural selection or even a mutation of DNA. It is a theory of organic evolution.
What is the Age of man : - a)Proterozoic
- b)Recent
- c) Mesozoic
- d)100 years
Correct answer is option 'B'. Can you explain this answer?
What is the Age of man :
a)
Proterozoic
b)
Recent
c)
Mesozoic
d)
100 years
|
Sara Khan answered |
B option-- RECENT
man originated in coenozoic era, which is presently the lastest era, among these, Recent is the correct answer
man originated in coenozoic era, which is presently the lastest era, among these, Recent is the correct answer
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