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NCERT Exemplar · Class 12 · Biology

Chapter 1: Reproduction in Organisms

Practice each question, then open the answer or worked solution.

Multiple Choice Questions

18 questions
Q11Multiple choice

Which of the following statements, support the view that elaborate sexual the reproductive process appeared much later in organic evolution.

i.  Lower groups of organisms have simpler body design

ii. Asexual reproduction is common in lower groups

iii. Asexual reproduction is common in higher groups of organisms

iv. The high incidence of sexual reproduction in angiosperms and vertebrates

Choose the correct answer from the options given below:

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Correct option: C
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Worked solution

Ans: The correct answer is option (c) i, ii and iv

Asexual reproduction is the kind of reproduction in which fusion of gametes is not there. In this kind of reproduction only one parent is involved. It mainly occurs in lower organisms & is very less efficient in terms of survival. Hence, statement (iii) will be incorrect.


Q12Multiple choice

Offspring formed by sexual reproduction exhibit more variation than those formed by Asexual reproduction because:

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Correct option: B
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Ans: The correct answer is option (b).

During gamete formation the no. of chromosomes become half due to the meiosis (reductional division). Both the parents contribute 50% each in the form of gamete ultimately give rise to offspring that is provided with the same no. of chromosomes as the parents have & also with variation which are due to the crossing over.


Q13Multiple choice

Choose the correct statement from amongst the following:

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Correct option: C
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Ans: The correct answer is option (c).

Dioecious organisms are those in which male and female reproductive parts are present in different organisms whereas monoecious organisms are those in which male and female reproductive parts are present in the same organism. Monoecious organisms are also called hermaphrodites. The example of dioecious organisms & plants are mammals, birds & insects, mulberry, sago & kiwi fruit respectively.


Q14Multiple choice

There is no natural death in single celled organisms like Amoeba and bacteria because:

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Correct option: C
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Ans: The correct answer is option (c)

Amoeba is the unicellular organism that reproduces by the process of binary fission (asexual reproduction). During this parent cell divides into two daughter cells that later on acts as an individual amoeba. Hence, there is no natural death in single celled organisms like Amoeba and bacteria.


Q15Multiple choice

There are various types of reproduction. The type of reproduction adopted by an organism depends on-:

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Correct option: D
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Ans: The correct answer is option (d).

The type of reproduction adopted by an organism depends upon the organism’s habitat, physiology, and its genetic makeup.


Q16Multiple choice

Identify the incorrect statement.

or without the formation of gametes

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Correct option: B
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Ans: The correct answer is option (b).

Zoospores are the asexual structure that produces in some algae & certain protozoans such as Phytophthora. These are motile in nature due to the presence of flagella in them.


Q17Multiple choice

Which of the following is a post-fertilization event in flowering plants?

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Correct option: B
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Ans: The correct answer is option (b) embryo development.

Post-fertilization events are those that occur after fertilization (fusion of gametes). The correct sequence of sexual reproduction in flowering plants are -:

Gametogenesis→ Pollination→ Fertilization→ Embryo development

←Pre-Fertilization event→                              ←Post fertilization→


Q18Multiple choice

The number of chromosomes in the shoot tip cells of a maize plant is 20. The number of chromosomes in the microspore mother cells of the same plant shall be:

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Correct option: A
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Ans: The correct answer is option (a) 20.

This is because microspore mother cells have the same ploidy as that of the somatic vegetative cells.