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All questions of How do Organisms Reproduce? for Class 10 Exam
When a sperm is deposited into the vagina which route does it travel?- a)Vagina → Oviduct → Uterus → Cervix
- b)Vagina → Ovary → Uterus → Oviduct
- c)Vagina → Cervix → Uterus → Oviduct
- d)Vagina → Uterus → Cervix → Oviduct
Correct answer is option 'C'. Can you explain this answer?
When a sperm is deposited into the vagina which route does it travel?
a)
Vagina → Oviduct → Uterus → Cervix
b)
Vagina → Ovary → Uterus → Oviduct
c)
Vagina → Cervix → Uterus → Oviduct
d)
Vagina → Uterus → Cervix → Oviduct
|
Gayatri bajaj answered |
B) Cervix
c) Uterus
d) Fallopian tubes
c) Uterus
d) Fallopian tubes
What marks the beginning of the reproductive life of a woman?- a)Menopause
- b)Menarche
- c)Fertilisation
- d)Ovulation
Correct answer is option 'B'. Can you explain this answer?
What marks the beginning of the reproductive life of a woman?
a)
Menopause
b)
Menarche
c)
Fertilisation
d)
Ovulation
|
|
Poorvi.m. Singh answered |
Menarch leads to the release of matured egg every month which gives a chance for fertilisation
Which is the most common method of reproduction in majority of fungi and bacteria?- a)Budding
- b)Binary fission
- c)Spore formation
- d)Multiple fission
Correct answer is option 'B'. Can you explain this answer?
Which is the most common method of reproduction in majority of fungi and bacteria?
a)
Budding
b)
Binary fission
c)
Spore formation
d)
Multiple fission
|
Pritam Khanna answered |
Parthenogenesis is the process of reproduction from an ovum without undertaking fertilization and is chiefly seen in lower plants and some classes of invertebrates
Vegetative propagation is a form of sexual reproduction seen in higher plants, it involves growing a new plant from a fragment of the parent plant.
Budding is another form of asexual reproduction found in lower eukaryotes like yeast and hydra.
Binary fission involves splitting up of a single paternal cell into two daughter cells. This is the primary method for bacterial reproduction.
Spore formation is a method of asexual reproduction where the parent plant produces hundreds of tiny spores which can grow into new plants.
Asexual reproduction is good because it:- a)Involves two parents
- b)Is simple and fast
- c)Shows no variation
- d)Produces defect in offspring
Correct answer is option 'B'. Can you explain this answer?
Asexual reproduction is good because it:
a)
Involves two parents
b)
Is simple and fast
c)
Shows no variation
d)
Produces defect in offspring
|
Anjana Khatri answered |
Asexual reproduction occurs when an organism makes more of itself without exchanging genetic information with another organism through sex.In sexually reproducing organisms, the genomes of two parents are combined to create offspring with unique genetic profiles. This is beneficial to the population because genetically diverse populations have a higher chance of withstanding survival challenges such as disease and environmental changes.
Asexually reproducing organisms can suffer a dangerous lack of diversity – but they can also reproduce faster than sexually reproducing organisms, and a single individual can found a new population without the need for a mate.
The ability to reproduce is lost in a female after- a)fertilisation
- b)menstruation
- c)gamete formation
- d)menopause
Correct answer is option 'D'. Can you explain this answer?
The ability to reproduce is lost in a female after
a)
fertilisation
b)
menstruation
c)
gamete formation
d)
menopause
|
|
Poorvi.m. Singh answered |
After menaphause ..eggs r not released by ovary and hence fertilisation can not take place..
Which part of seed on germination develops into shoot?- a)Funicle
- b)Cotyledon
- c)Radicle
- d)Plumule
Correct answer is option 'D'. Can you explain this answer?
Which part of seed on germination develops into shoot?
a)
Funicle
b)
Cotyledon
c)
Radicle
d)
Plumule
|
Rahul Kapoor answered |
In plant physiology, the epicotyl is the embryonic shoot above the cotyledons. In most plants theepicotyl will eventually develop into the leaves of the plant. In dicots, the hypocotyl is what appears to be the base stem under the spent withered cotyledons, and the shoot just above that is theepicotyl.
Which is commonly called as plumule , which forms shoot parts And radicle forms root parts.
Which of the following is not an artificial method of vegetative propagation?- a)Cutting
- b)Layering
- c)Budding
- d)Graftin
Correct answer is option 'C'. Can you explain this answer?
Which of the following is not an artificial method of vegetative propagation?
a)
Cutting
b)
Layering
c)
Budding
d)
Graftin
|
|
Arun Sharma answered |
Option ( c) budding is correct because other options ( cutting, layering, graftin) are the artificial method of vegetative propagation.
The ability of an organism to develop whole body from a broken piece or fragment is called- a)binary fission
- b)budding
- c)multiple fission
- d)regeneration
Correct answer is option 'D'. Can you explain this answer?
The ability of an organism to develop whole body from a broken piece or fragment is called
a)
binary fission
b)
budding
c)
multiple fission
d)
regeneration
|
Vikram Kapoor answered |
Regeneration is one of the processes in which if an organism is cut into several pieces, each of its parts regrows to the original state. This process is carried out by specialized cells called stem cells.
New plants can be produces without the help of any reproductive organ by:- a)Vegetative propagation
- b)Regeneration
- c)Budding
- d)Fragmentation
Correct answer is option 'A'. Can you explain this answer?
New plants can be produces without the help of any reproductive organ by:
a)
Vegetative propagation
b)
Regeneration
c)
Budding
d)
Fragmentation
|
Mahi Ashta. answered |
Ofcourse....A is rytt....as vegetative propagation is...an artificial method of.... reproduction in..which the nodes ..of one...plant attached with internodes of other ...plant as not ...of the same plant...
Human beings are more genetically advanced than monkey because of:- a)Fragmentation
- b)Reproduction
- c)Budding
- d)Variation
Correct answer is option 'D'. Can you explain this answer?
Human beings are more genetically advanced than monkey because of:
a)
Fragmentation
b)
Reproduction
c)
Budding
d)
Variation
|
|
Rajiv Gupta answered |
Human variability refers to the fact that there is a range of possible values for each of the numerous physical and mental characteristics of human beings. Fundamental Characteristic. Variation is, in fact, inherent in every living species.
In Spirogyra, asexual reproduction takes place by- a)division of cell into two cells
- b)breaking up of filaments into smaller bits
- c)division of cell into many cells
- d)formation of young cells from older cells
Correct answer is option 'B'. Can you explain this answer?
In Spirogyra, asexual reproduction takes place by
a)
division of cell into two cells
b)
breaking up of filaments into smaller bits
c)
division of cell into many cells
d)
formation of young cells from older cells
|
Aakash krishnan answered |
Spirogyra reproduces asexually by fragmentation.
A benefit of plant grown by vegetative propagation is :- a)Lose vigor
- b)Less adaptability to environment
- c)Better quality can be maintained
- d)Induces overcrowding
Correct answer is option 'C'. Can you explain this answer?
A benefit of plant grown by vegetative propagation is :
a)
Lose vigor
b)
Less adaptability to environment
c)
Better quality can be maintained
d)
Induces overcrowding
|
|
Rohan Kapoor answered |
Vegetative propagation is a type of asexual reproduction in plants which produces new organisms and does not involve the production of seeds or spores. It can be natural or can be induced. This type of reproduction is common to have desirable characteristics in a particular group of plants. Vegetative propagation is preferred to sexual reproduction for many reasons but mostly it preferred as it is an easy process and is a faster way to propagation of certain plants. In this method of artificial reproduction there are more amounts of clone produced and is better quality than the actual seedlings.
Advantage of Vegetative Propagation
The main advantage of vegetative propagation methods is that the new plants contain the genetic material of only one parent, so they are essentially clones of the parent plant. This means that, once you have a plant with desirable traits, you can reproduce the same traits indefinitely, as long as the growing conditions remain similar. This is especially important for commercial growers who want to reproduce the highest-quality plants and ensure consistency of a variety of plant or crop for sale. This can also help to maintain consistent quality and taste in products made from plants or crops. For example, in Zealong’s tea plantation, they propagate new tea plants using cuttings to ensure consistency in the taste and quality of their tea.
Many unicellular organisms reproduce by the process of- a)fission
- b)ovulation
- c)regeneration
- d)non-disjunction
Correct answer is option 'A'. Can you explain this answer?
Many unicellular organisms reproduce by the process of
a)
fission
b)
ovulation
c)
regeneration
d)
non-disjunction
|
|
Anita Menon answered |
In fission (or binary fission), a parent separates into two or more individuals of about equal size. This type of reproduction is common among single-celled organisms including bacteria, archaea, and unicellular eukaryotes, such as protists and some fungi. The single cell divides into two daughter cells.
Variation in organisms is due to:- a)Cloning
- b)Body design
- c)Fusions of gametes
- d)Multiplication
Correct answer is option 'C'. Can you explain this answer?
Variation in organisms is due to:
a)
Cloning
b)
Body design
c)
Fusions of gametes
d)
Multiplication
|
Indu Gupta answered |
When gametes of two parents fuse together it results in variations. Variation is due to change in the structure of DNA.
Organism look similar because of similar:- a)Nuclei
- b)Ears
- c)Body design
- d)Eyes
Correct answer is option 'C'. Can you explain this answer?
Organism look similar because of similar:
a)
Nuclei
b)
Ears
c)
Body design
d)
Eyes
|
|
Ananya Das answered |
Organisms look similar because their body designs are similar. If body designs are to be similar , the blueprints for these designs should be similar.
In the list of organisms given below, those that reproduce by the asexual method are
(i) dog
(ii) banana
(iii) yeast
(iv) amoeba- a)(i), (iii) and (iv)
- b)(i), (ii) and (iii)
- c)(i), (ii) and (iv)
- d)(ii), (iii) and (iv)
Correct answer is option 'D'. Can you explain this answer?
In the list of organisms given below, those that reproduce by the asexual method are
(i) dog
(ii) banana
(iii) yeast
(iv) amoeba
(i) dog
(ii) banana
(iii) yeast
(iv) amoeba
a)
(i), (iii) and (iv)
b)
(i), (ii) and (iii)
c)
(i), (ii) and (iv)
d)
(ii), (iii) and (iv)
|
|
Vikram Kapoor answered |
Asexual reproduction is the mode of reproduction in single parent produces offsprings. Amoeba reproduces asexually by binary fission. Asexual reproduction occurs in yeast by means of budding and in banana asexual reproduction occur by means of vegetative propagation from the stem. Thus, the correct answer is option D.
Offspring formed by asexual method of reproduction have greater similarity among themselves because
(i) asexual reproduction does not involve fusion of gametes.
(ii) asexual reproduction involves only one parent.
(iii) asexual reproduction occurs before sexual reproduction.
(iv) asexual reproduction occurs after sexual reproduction.- a)(i) and (ii)
- b)(i) and (iii)
- c)(ii) and (iv)
- d)(iii)and (iv)
Correct answer is option 'A'. Can you explain this answer?
Offspring formed by asexual method of reproduction have greater similarity among themselves because
(i) asexual reproduction does not involve fusion of gametes.
(ii) asexual reproduction involves only one parent.
(iii) asexual reproduction occurs before sexual reproduction.
(iv) asexual reproduction occurs after sexual reproduction.
(i) asexual reproduction does not involve fusion of gametes.
(ii) asexual reproduction involves only one parent.
(iii) asexual reproduction occurs before sexual reproduction.
(iv) asexual reproduction occurs after sexual reproduction.
a)
(i) and (ii)
b)
(i) and (iii)
c)
(ii) and (iv)
d)
(iii)and (iv)
|
Naina Sharma answered |
Individuals formed by asexual reproduction have the same genetic make up as that of parent.
Which of the following plant has unisexual flowers?- a)Hibiscus
- b)Mustard
- c)Papaya
- d)Pansy
Correct answer is option 'C'. Can you explain this answer?
Which of the following plant has unisexual flowers?
a)
Hibiscus
b)
Mustard
c)
Papaya
d)
Pansy
|
|
Ananya Das answered |
Papaya has Unisexual flowers ie., make flowers and female flowers are on separate plants. So, the correct answer is papaya.
The correct sequence of reproductive stages seen in flowering plants is- a)gametes, embiyo, zygote, seedling
- b)seedling, embryo, zygote, gametes
- c)zygote, gametes, embiyo, seedling
- d)gametes, zygote, embryo, seedling
Correct answer is option 'D'. Can you explain this answer?
The correct sequence of reproductive stages seen in flowering plants is
a)
gametes, embiyo, zygote, seedling
b)
seedling, embryo, zygote, gametes
c)
zygote, gametes, embiyo, seedling
d)
gametes, zygote, embryo, seedling
|
|
Pooja Shah answered |
During fertilisation gametes fuse to form zygote which later forms embryo which develops into seedling.
Reproduction is important as it allows:- a)Loss of vigour
- b)Sterility in organism
- c)Perpetuation of species
- d)Defects in offspring
Correct answer is option 'C'. Can you explain this answer?
Reproduction is important as it allows:
a)
Loss of vigour
b)
Sterility in organism
c)
Perpetuation of species
d)
Defects in offspring
|
Gaurav Kumar answered |
The main significance of reproduction is to maintain continuity of species. It also helps in studying evolution as sexual reproduction results in variation among the species.
Pollen grains are produced by- a)ovary
- b)ovule
- c)anther
- d)coroll
Correct answer is option 'C'. Can you explain this answer?
Pollen grains are produced by
a)
ovary
b)
ovule
c)
anther
d)
coroll
|
|
Ananya Das answered |
Anther is the male reproductive part of a flower from which pollen grains when are released during maturation the transfer of pollen grains from anther to stigma take place. So, option C is correct that anther produces pollen grains.
Which of the following is capable of producing a new plant?- a)Germ cell
- b)Pollen grain
- c)Ovule
- d)Seed
Correct answer is option 'D'. Can you explain this answer?
Which of the following is capable of producing a new plant?
a)
Germ cell
b)
Pollen grain
c)
Ovule
d)
Seed
|
|
Anjana Khatri answered |
The primary function of seeds is reproduction in which plants perpetuate themselves, mainly sexually. The seed is widely used in the deliberate production of seedlings, known as plant propagation. In addition, this organ also serves as a diaspore or dispersal unit of many plants.
Where does fertilisation take place?- a)Uterus
- b)Vagina
- c)Fallopian tube
- d)Cervix
Correct answer is option 'C'. Can you explain this answer?
Where does fertilisation take place?
a)
Uterus
b)
Vagina
c)
Fallopian tube
d)
Cervix
|
|
Harshita Sharma answered |
Fallopian tube - where fertilisation take place
Uterus - where implantation take place
In case the ova does not fertilise, which of the following events will take place?- a)Menstruation
- b)Pregnancy
- c)Implantation
- d)Ovulation
Correct answer is option 'A'. Can you explain this answer?
In case the ova does not fertilise, which of the following events will take place?
a)
Menstruation
b)
Pregnancy
c)
Implantation
d)
Ovulation
|
|
Poorvi.m. Singh answered |
Option a is right answer because .....the wall of uterus will thicken to recieve the fertilized egg in case of no fertilisation....the thickened lining of uterus along with some blood vessels shud off....which is known as menstruation
Which of the following is the correct sequence of events of sexual reproduction in a flower?
- a)pollination, fertilisation, seedling, embryo
- b)seedling, embryo, fertilisation, pollination
- c)pollination, fertilisation, embryo, seedling
- d)embryo, seedling, pollination, fertilisation
Correct answer is option 'C'. Can you explain this answer?
Which of the following is the correct sequence of events of sexual reproduction in a flower?
a)
pollination, fertilisation, seedling, embryo
b)
seedling, embryo, fertilisation, pollination
c)
pollination, fertilisation, embryo, seedling
d)
embryo, seedling, pollination, fertilisation
|
|
Vikas Kumar answered |
Sexual reproduction in flowering plants involves the production of male and female gametes, the transfer of the male gametes to the female ovules in a process called pollination. After pollination occurs, fertilization happens and the ovules grow into seeds within a fruit.
Development of offsprings identical to their parents is the result of:- a)Fertilization
- b)Pollination
- c)Asexual reproduction
- d)Sexual reproduction
Correct answer is option 'C'. Can you explain this answer?
Development of offsprings identical to their parents is the result of:
a)
Fertilization
b)
Pollination
c)
Asexual reproduction
d)
Sexual reproduction
|
|
Vikas Kumar answered |
Asexual reproduction involves a single parent. It results in offspring that are genetically identical to each other and to the parent. All prokaryotes and some eukaryotes reproduce this way. Binary fission occurs when a parent cell splits into two identical daughter cells of the same size.
Length of pollen tube depends on the distance between- a)pollen grain on upper surface of stigma and ovule
- b)pollen grain and upper surface of stigma
- c)upper surface of stigma and lower part of style
- d)pollen grain in anther and upper surface of stigma
Correct answer is option 'A'. Can you explain this answer?
Length of pollen tube depends on the distance between
a)
pollen grain on upper surface of stigma and ovule
b)
pollen grain and upper surface of stigma
c)
upper surface of stigma and lower part of style
d)
pollen grain in anther and upper surface of stigma
|
|
Harshit Agrawal answered |
Option B
The number of chromosomes in parents and offsprings of a particular species remains constant due to- a)halving of chromosomes after gamete formation
- b)doubling of chromosome after gamete formation
- c)halving of chromosome during gamete formation
- d)doubling of chromosome after zygote formation
Correct answer is option 'C'. Can you explain this answer?
The number of chromosomes in parents and offsprings of a particular species remains constant due to
a)
halving of chromosomes after gamete formation
b)
doubling of chromosome after gamete formation
c)
halving of chromosome during gamete formation
d)
doubling of chromosome after zygote formation
|
|
Amit Kumar answered |
Gametes have half the number of chromosome (n) as they are formed by meiosis. After syngamy the (2n) diploidy is restored in zygote.
In the list of organisms given below, those that reproduce by the asexual method are
(i) banana
(ii) dog
(iii) yeast
(iv) Amoeba- a)(ii) and (iv)
- b)(i), (iii) and (iv)
- c)(i) and (iv)
- d)(ii), (iii) and (iv)
Correct answer is option 'B'. Can you explain this answer?
In the list of organisms given below, those that reproduce by the asexual method are
(i) banana
(ii) dog
(iii) yeast
(iv) Amoeba
(i) banana
(ii) dog
(iii) yeast
(iv) Amoeba
a)
(ii) and (iv)
b)
(i), (iii) and (iv)
c)
(i) and (iv)
d)
(ii), (iii) and (iv)
|
|
Amit Sharma answered |
Asexual reproduction is the mode of reproduction in single parent produces offsprings. Amoeba reproduces asexually by binary fission. Asexual reproduction occurs in yeast by means of budding and in banana asexual reproduction occur by means of vegetative propagation from the stem. Thus, the correct answer is option B.
A student sowed two pieces of potato (A) with eye, (B) without eye. In which case plant will grow.- a)A
- b)B
- c)Both
- d)None
Correct answer is option 'A'. Can you explain this answer?
A student sowed two pieces of potato (A) with eye, (B) without eye. In which case plant will grow.
a)
A
b)
B
c)
Both
d)
None
|
|
Vikas Kumar answered |
The soil should be loose enough for the potato to send down roots easily. Take a piece of seed potato and press it firmly into contact with the soil. Be sure the “eye” faces up, as in the photo at left. Potatoes, unlike other garden crops, are usually not grown from small seeds. Instead, they grow from small cubes of tubers cut into chunks with at least two "eyes" known as seed potatoes. ... A potato's eyes only form and sprout under favorable growing conditions and after breaking from a dormant state.
Evolutionary change is not possible in:- a)Cross pollination
- b)Sexual reproduction
- c)Asexual reproduction
- d)Fertilization
Correct answer is option 'C'. Can you explain this answer?
Evolutionary change is not possible in:
a)
Cross pollination
b)
Sexual reproduction
c)
Asexual reproduction
d)
Fertilization
|
Mira Sharma answered |
The correct option is C.
In asexual reproduction an exact genetic copy of the parent organism is produced (a clone ). Unlike sexual reproduction, asexual reproduction only introduces genetic variation into the population if a random mutation in the organism's DNA is passed on to the offspring.
In asexual reproduction an exact genetic copy of the parent organism is produced (a clone ). Unlike sexual reproduction, asexual reproduction only introduces genetic variation into the population if a random mutation in the organism's DNA is passed on to the offspring.
Most of the flowering plants can reproduce by:- a)Sexual reproduction
- b)Cloning
- c)Asexual reproduction
- d)Spore formation
Correct answer is option 'A'. Can you explain this answer?
Most of the flowering plants can reproduce by:
a)
Sexual reproduction
b)
Cloning
c)
Asexual reproduction
d)
Spore formation
|
|
Anjana Khatri answered |
Often their most distinguishing feature is their reproductive organs, commonly called flowers. Sexual reproduction in flowering plants involves the production of male and female gametes, the transfer of the male gametes to the female ovules in a process called pollination.
Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion : Asexual reproduction is a primitive type of reproduction.Reason : Asexual reproduction involves only mitotic cell division.- a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
- b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
- c)Assertion (A) is true but reason (R) is false.
- d)Assertion (A) is false but reason (R) is true.
- e)Both Assertion and Reason are false.
Correct answer is option 'A'. Can you explain this answer?
Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:
Assertion : Asexual reproduction is a primitive type of reproduction.
Reason : Asexual reproduction involves only mitotic cell division.
a)
Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
b)
Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
c)
Assertion (A) is true but reason (R) is false.
d)
Assertion (A) is false but reason (R) is true.
e)
Both Assertion and Reason are false.
|
|
Amit Kumar answered |
Organisms reproduce for perpetuation of species because individuals have a limited life span. Organisms may reproduce sexually as well as asexually. The sexual reproduction involves formation of haploid gametes through the process of reduction division or meiosis. The haploid gametes fuse during fertilization to form diploid zygote. Thus, restoring the normal ploidy. The asexual reproduction does not involves gamete formation through meiosis or their fertilization. The vegetative propagation in plants is a type of asexual reproduction in which plant body is propagated directly from some vegetative part of adult plant.
Which of the following statements is not correct about reproduction ?- a)Lot of energy is spent in reproduction
- b)Reproduction creates more individuals
- c)Animals reproduces only by sexual mode of reproduction
- d)Reproduction is not necessary to maintain the life of an individual
Correct answer is option 'C'. Can you explain this answer?
Which of the following statements is not correct about reproduction ?
a)
Lot of energy is spent in reproduction
b)
Reproduction creates more individuals
c)
Animals reproduces only by sexual mode of reproduction
d)
Reproduction is not necessary to maintain the life of an individual
|
|
Ananya Das answered |
Some animals like hydra reproduce by asexual means. Reproduction is not necessary to maintain life.
Which of the following sequence is correct sequence of sexual reproduction in a flower?- a)Embryo, seedling, pollination, fertilisation
- b)Pollination, fertilisation, embryo, seedling
- c)Seedling, embryo, fertilisation, pollination
- d)Pollination, fertilisation, seedling, embryo
Correct answer is option 'B'. Can you explain this answer?
Which of the following sequence is correct sequence of sexual reproduction in a flower?
a)
Embryo, seedling, pollination, fertilisation
b)
Pollination, fertilisation, embryo, seedling
c)
Seedling, embryo, fertilisation, pollination
d)
Pollination, fertilisation, seedling, embryo
|
Anmol Chatterjee answered |
In pollination, pollen grains transfer from stamen to stigma after which fertilisation takes place during which germ cells fuse together to form zygote which in turn leads to embryo formation. Fertilised ovule becomes seed and seeds germinate to produce Seedling.
Leishmania reproduce asexually by
- a)multiple fission
- b)binary fission
- c)binary fission in a definite orientation
- d)budding
Correct answer is option 'C'. Can you explain this answer?
Leishmania reproduce asexually by
a)
multiple fission
b)
binary fission
c)
binary fission in a definite orientation
d)
budding
|
|
Arvind bajaj answered |
Leishmania reproduces by binary fission.
Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion : Pollen grains from the carpel stick to the stigma of stamen.Reason : The fertilised egg cells grow inside the ovules and become seeds.- a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
- b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
- c)Assertion (A) is true but reason (R) is false.
- d)Assertion (A) is false but reason (R) is true.
- e)Both Assertion and Reason are false.
Correct answer is option 'D'. Can you explain this answer?
Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:
Assertion : Pollen grains from the carpel stick to the stigma of stamen.
Reason : The fertilised egg cells grow inside the ovules and become seeds.
a)
Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
b)
Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
c)
Assertion (A) is true but reason (R) is false.
d)
Assertion (A) is false but reason (R) is true.
e)
Both Assertion and Reason are false.
|
|
Meera Rana answered |
The pollen grain is transferred from the anther to the stigma of the carpel. The stigma is the receptive surface of the female part of the flower.
On the other hand, the ovary often supports a long style, topped by a stigma. The mature ovary is a fruit, and the mature ovule is a seed. The stigma is the part of the pistil where pollen germinates.
Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion : At puberty, in boys, the voice begins to crack and thick hair grows on the face.Reason : At puberty, there is decreased secretion of testosterone in boys.- a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
- b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
- c)Assertion (A) is true but reason (R) is false.
- d)Assertion (A) is false but reason (R) is true.
- e)Both Assertion and Reason are false.
Correct answer is option 'C'. Can you explain this answer?
Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:
Assertion : At puberty, in boys, the voice begins to crack and thick hair grows on the face.
Reason : At puberty, there is decreased secretion of testosterone in boys.
a)
Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
b)
Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
c)
Assertion (A) is true but reason (R) is false.
d)
Assertion (A) is false but reason (R) is true.
e)
Both Assertion and Reason are false.
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Vivek Rana answered |
Puberty in boys is regulated by male sex hormone called testosterone, which are secreted by testes. In puberty, secondary sexual characteristics like growth of hair on face, chest, broadening of shoulders and deepening of voice occurs.
A feature of reproduction that is common to Malarial parasite, Spirogyra and Yeast is that- a)they all are multicellular
- b)they all reproduce sexually only
- c)they reproduce asexually
- d)they all are unicellular
Correct answer is option 'C'. Can you explain this answer?
A feature of reproduction that is common to Malarial parasite, Spirogyra and Yeast is that
a)
they all are multicellular
b)
they all reproduce sexually only
c)
they reproduce asexually
d)
they all are unicellular
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Krishna Iyer answered |
In all of them asexual reproduction takes place e.g., in spirogyra fragmentation, malarial parasite multiple fission and in yeast by budding.
Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion : Vagina is also called the birth canal.Reason : During birth, the baby passes through the vagina.- a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
- b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
- c)Assertion (A) is true but reason (R) is false.
- d)Assertion (A) is false but reason (R) is true.
- e)Both Assertion and Reason are false.
Correct answer is option 'A'. Can you explain this answer?
Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:
Assertion : Vagina is also called the birth canal.
Reason : During birth, the baby passes through the vagina.
a)
Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
b)
Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
c)
Assertion (A) is true but reason (R) is false.
d)
Assertion (A) is false but reason (R) is true.
e)
Both Assertion and Reason are false.
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Aditya Shah answered |
Vagina is called the birth canal, because the baby passes through the vagina during birth.
Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion : Asexual reproduction is also called blastogenesis.Reason : In asexual reproduction, their is no formation and fusion of gametes.- a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
- b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
- c)Assertion (A) is true but reason (R) is false.
- d)Assertion (A) is false but reason (R) is true.
- e)Both Assertion and Reason are false.
Correct answer is option 'B'. Can you explain this answer?
Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:
Assertion : Asexual reproduction is also called blastogenesis.
Reason : In asexual reproduction, their is no formation and fusion of gametes.
a)
Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
b)
Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
c)
Assertion (A) is true but reason (R) is false.
d)
Assertion (A) is false but reason (R) is true.
e)
Both Assertion and Reason are false.
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Amit Kumar answered |
The process of asexual reproduction with the help of any part of the body not inclusive of the reproductive parts is known as blastogenesis. Asexual reproduction is the method in which single parent gives rise to the offspring. There is no formation or fusion of the gametes because the single parent is involved.
Thus, the correct answer is option B.
Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion : Vasectomy is a surgical method or birth control.Reason : In vasectomy, a small portion of the oviduct is cut or tied properly.- a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
- b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
- c)Assertion (A) is true but reason (R) is false.
- d)Assertion (A) is false but reason (R) is true.
- e)Both Assertion and Reason are false.
Correct answer is option 'C'. Can you explain this answer?
Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:
Assertion : Vasectomy is a surgical method or birth control.
Reason : In vasectomy, a small portion of the oviduct is cut or tied properly.
a)
Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
b)
Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
c)
Assertion (A) is true but reason (R) is false.
d)
Assertion (A) is false but reason (R) is true.
e)
Both Assertion and Reason are false.
|
|
Rohit Sharma answered |
Vasectomy is a surgical method or birth control. in which a small portion of the sperm duct is cut or tied properly.
Characters transmitted from parents to offspring are present in- a)protoplasm
- b)cytoplasm
- c)genes
- d)gemmule
Correct answer is option 'C'. Can you explain this answer?
Characters transmitted from parents to offspring are present in
a)
protoplasm
b)
cytoplasm
c)
genes
d)
gemmule
|
|
Ananya Das answered |
DNA is the heridity material and genes which are located on chromosomes are made up of DNA.
Organism produced from two parents is an example of:- a)Asexual reproduction
- b)Sexual reproduction
- c)Binary fission
- d)Evolution
Correct answer is option 'B'. Can you explain this answer?
Organism produced from two parents is an example of:
a)
Asexual reproduction
b)
Sexual reproduction
c)
Binary fission
d)
Evolution
|
EduRev Class 10 answered |
Sexual Reproduction
- Sexual reproduction involves the fusion of gametes from two parents to produce offspring with a combination of genetic traits.
- This process ensures genetic diversity and variation within a population.
- It requires the involvement of specialized reproductive organs and mechanisms, such as fertilization and meiosis.
- In sexual reproduction, the offspring inherit traits from both parents, resulting in a unique combination of genetic material.
- The genetic variation introduced through sexual reproduction can enhance the adaptability and survival of a species in changing environments.
- Examples of sexual reproduction include the union of sperm and egg cells in animals, pollination in plants, and mating in fungi.
- It is a common method of reproduction in most multicellular organisms, including humans.
- In contrast, asexual reproduction involves the production of offspring from a single parent without the involvement of gametes or fertilization.
- Asexual reproduction leads to genetically identical offspring, limiting genetic diversity and adaptability.
Therefore, the correct answer is B: Sexual reproduction.
- Sexual reproduction involves the fusion of gametes from two parents to produce offspring with a combination of genetic traits.
- This process ensures genetic diversity and variation within a population.
- It requires the involvement of specialized reproductive organs and mechanisms, such as fertilization and meiosis.
- In sexual reproduction, the offspring inherit traits from both parents, resulting in a unique combination of genetic material.
- The genetic variation introduced through sexual reproduction can enhance the adaptability and survival of a species in changing environments.
- Examples of sexual reproduction include the union of sperm and egg cells in animals, pollination in plants, and mating in fungi.
- It is a common method of reproduction in most multicellular organisms, including humans.
- In contrast, asexual reproduction involves the production of offspring from a single parent without the involvement of gametes or fertilization.
- Asexual reproduction leads to genetically identical offspring, limiting genetic diversity and adaptability.
Therefore, the correct answer is B: Sexual reproduction.
Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion : Holoblastic cleavage with almost equal sized blastomeres is a characteristic of placental animals.Reason : Eggs of most mammals, including humans, are of centrolecithal type.- a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
- b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
- c)Assertion (A) is true but reason (R) is false.
- d)Assertion (A) is false but reason (R) is true.
- e)Both Assertion and Reason are false.
Correct answer is option 'C'. Can you explain this answer?
Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:
Assertion : Holoblastic cleavage with almost equal sized blastomeres is a characteristic of placental animals.
Reason : Eggs of most mammals, including humans, are of centrolecithal type.
a)
Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
b)
Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
c)
Assertion (A) is true but reason (R) is false.
d)
Assertion (A) is false but reason (R) is true.
e)
Both Assertion and Reason are false.
|
|
Jithin Dasgupta answered |
Assertion: Holoblastic cleavage with almost equal sized blastomeres is a characteristic of placental animals.
Reason: Eggs of most mammals, including humans, are of centrolecithal type.
Explanation:
Assertion (A) is true but reason (R) is false.
Holoblastic cleavage refers to the type of cleavage that occurs in animal embryos where the entire zygote divides completely during cell division. In holoblastic cleavage, the blastomeres (cells formed after cleavage) are approximately equal in size.
Placental animals, also known as eutherians, are a group of mammals that give birth to fully developed young ones. They have a placenta, which is an organ that provides nourishment and oxygen to the developing embryo. Holoblastic cleavage with almost equal-sized blastomeres is indeed a characteristic of placental animals.
However, the reason provided is incorrect. The eggs of most mammals, including humans, are not of centrolecithal type. Centrolecithal eggs are characterized by a large central yolk surrounded by a thin layer of cytoplasm and a plasma membrane. This type of egg is found in insects and some other invertebrates.
Mammals, on the other hand, have either isolecithal or telolecithal eggs. Isolecithal eggs have a small amount of evenly distributed yolk, while telolecithal eggs have a large amount of yolk concentrated at one end of the egg. Humans have isolecithal eggs, which means that the yolk is evenly distributed throughout the cytoplasm.
Therefore, the reason provided does not correctly explain the assertion. The correct answer is option 'C' - Assertion (A) is true but reason (R) is false.
Reason: Eggs of most mammals, including humans, are of centrolecithal type.
Explanation:
Assertion (A) is true but reason (R) is false.
Holoblastic cleavage refers to the type of cleavage that occurs in animal embryos where the entire zygote divides completely during cell division. In holoblastic cleavage, the blastomeres (cells formed after cleavage) are approximately equal in size.
Placental animals, also known as eutherians, are a group of mammals that give birth to fully developed young ones. They have a placenta, which is an organ that provides nourishment and oxygen to the developing embryo. Holoblastic cleavage with almost equal-sized blastomeres is indeed a characteristic of placental animals.
However, the reason provided is incorrect. The eggs of most mammals, including humans, are not of centrolecithal type. Centrolecithal eggs are characterized by a large central yolk surrounded by a thin layer of cytoplasm and a plasma membrane. This type of egg is found in insects and some other invertebrates.
Mammals, on the other hand, have either isolecithal or telolecithal eggs. Isolecithal eggs have a small amount of evenly distributed yolk, while telolecithal eggs have a large amount of yolk concentrated at one end of the egg. Humans have isolecithal eggs, which means that the yolk is evenly distributed throughout the cytoplasm.
Therefore, the reason provided does not correctly explain the assertion. The correct answer is option 'C' - Assertion (A) is true but reason (R) is false.
How does cell division commonly occur in bacteria and protozoa?- a)By unequal splitting during division
- b)By forming multiple daughter cells
- c)By splitting into two equal halves
- d)By developing into spores
Correct answer is option 'C'. Can you explain this answer?
How does cell division commonly occur in bacteria and protozoa?
a)
By unequal splitting during division
b)
By forming multiple daughter cells
c)
By splitting into two equal halves
d)
By developing into spores
|
|
EduRev Class 10 answered |
Cell division in bacteria and protozoa commonly occurs by splitting into two equal halves. This process, known as binary fission, results in the formation of two identical daughter cells. Binary fission is a rapid and efficient way for these unicellular organisms to reproduce asexually.
Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion : Unisexual flowers have separate male and female flowers whereas a typical monocot embryo comprises an embryonal axis with single cotyledon.Reason : Cucumber, pumpkin and water melon are example of unisexual flowers.- a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
- b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
- c)Assertion (A) is true but reason (R) is false.
- d)Assertion (A) is false but reason (R) is true.
- e)Both Assertion and Reason are false.
Correct answer is option 'B'. Can you explain this answer?
Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:
Assertion : Unisexual flowers have separate male and female flowers whereas a typical monocot embryo comprises an embryonal axis with single cotyledon.
Reason : Cucumber, pumpkin and water melon are example of unisexual flowers.
a)
Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
b)
Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
c)
Assertion (A) is true but reason (R) is false.
d)
Assertion (A) is false but reason (R) is true.
e)
Both Assertion and Reason are false.
|
|
Amit Sharma answered |
Unisexual flowers have separate male and female flowers. The example includes cucumber, pumpkin and watermelon.
Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion : In the morula stage, cells divide without increases in size.Reason : Zona pellucida remain undivided till cleavage is complete.- a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
- b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
- c)Assertion (A) is true but reason (R) is false.
- d)Assertion (A) is false but reason (R) is true.
- e)Both Assertion and Reason are false.
Correct answer is option 'B'. Can you explain this answer?
Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:
Assertion : In the morula stage, cells divide without increases in size.
Reason : Zona pellucida remain undivided till cleavage is complete.
a)
Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
b)
Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
c)
Assertion (A) is true but reason (R) is false.
d)
Assertion (A) is false but reason (R) is true.
e)
Both Assertion and Reason are false.
|
|
Anup singh answered |
Assertion: In the morula stage, cells divide without increases in size.
Reason: Zona pellucida remains undivided till cleavage is complete.
Explanation:
- The morula stage is an early stage of embryonic development, characterized by a solid ball of cells formed by the cleavage of the zygote.
- Assertion: Cells divide without increases in size during the morula stage. This means that as the zygote undergoes cleavage, the individual cells formed do not grow in size. Instead, the zygote divides into smaller cells, resulting in a compact cluster of cells in the morula stage.
- Reason: The zona pellucida is a protective layer surrounding the mammalian oocyte (egg cell). It remains undivided until the cleavage is complete. The zona pellucida provides structural support and protects the developing embryo during early stages of development.
Explanation of the Correct Answer:
- Both the assertion and the reason are true.
- The assertion correctly states that cells divide without an increase in size during the morula stage.
- The reason correctly states that the zona pellucida remains undivided until the cleavage is complete.
- However, the reason does not provide a direct explanation for the assertion. The fact that the zona pellucida remains undivided does not directly explain why cells in the morula stage do not increase in size. Therefore, the reason is not the correct explanation of the assertion.
- Hence, the correct answer is option B: Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
Key Points:
- Morula stage: early stage of embryonic development characterized by a solid ball of cells.
- Cells divide without increasing in size during the morula stage.
- Zona pellucida: protective layer surrounding the mammalian oocyte.
- Zona pellucida remains undivided until cleavage is complete.
- Reason does not provide a direct explanation for the assertion.
Reason: Zona pellucida remains undivided till cleavage is complete.
Explanation:
- The morula stage is an early stage of embryonic development, characterized by a solid ball of cells formed by the cleavage of the zygote.
- Assertion: Cells divide without increases in size during the morula stage. This means that as the zygote undergoes cleavage, the individual cells formed do not grow in size. Instead, the zygote divides into smaller cells, resulting in a compact cluster of cells in the morula stage.
- Reason: The zona pellucida is a protective layer surrounding the mammalian oocyte (egg cell). It remains undivided until the cleavage is complete. The zona pellucida provides structural support and protects the developing embryo during early stages of development.
Explanation of the Correct Answer:
- Both the assertion and the reason are true.
- The assertion correctly states that cells divide without an increase in size during the morula stage.
- The reason correctly states that the zona pellucida remains undivided until the cleavage is complete.
- However, the reason does not provide a direct explanation for the assertion. The fact that the zona pellucida remains undivided does not directly explain why cells in the morula stage do not increase in size. Therefore, the reason is not the correct explanation of the assertion.
- Hence, the correct answer is option B: Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
Key Points:
- Morula stage: early stage of embryonic development characterized by a solid ball of cells.
- Cells divide without increasing in size during the morula stage.
- Zona pellucida: protective layer surrounding the mammalian oocyte.
- Zona pellucida remains undivided until cleavage is complete.
- Reason does not provide a direct explanation for the assertion.
Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion : Spores are unicellular bodies.Reason : The parent body simply breaks up into smaller pieces on maturation- a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
- b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
- c)Assertion (A) is true but reason (R) is false.
- d)Assertion (A) is false but reason (R) is true.
- e)Both Assertion and Reason are false.
Correct answer is option 'C'. Can you explain this answer?
Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:
Assertion : Spores are unicellular bodies.
Reason : The parent body simply breaks up into smaller pieces on maturation
a)
Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
b)
Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
c)
Assertion (A) is true but reason (R) is false.
d)
Assertion (A) is false but reason (R) is true.
e)
Both Assertion and Reason are false.
|
|
Radha Iyer answered |
Spore formation - Spore formation is generally seen in bacteria and most fungi. Spores are unicellular bodies, formed by the parent organism to carry out reproduction. If environmental conditions are suitable, the spore will develop into a new individual. Spores come in a wide variety of forms and are produced and dispersed in many different ways. Spores are very effective, because they are small and light, and so can be carried by wind, water or animals; so they can travel far away from the parent, perhaps to better conditions.
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