CBSE Class 9 Science Chapter 11: Reproduction: How Life Continues — Assertion & Reason
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The following Assertion and Reason questions are based on Chapter 11: Reproduction: How Life Continues from the NCERT Class 9 Science textbook. Each question has four options - read both the Assertion (A) and Reason (R) carefully before selecting your answer.
How to attempt Assertion & Reason questions:
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is NOT the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is NOT the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Assertion & Reason Questions
1
Assertion (A): Asexual reproduction commonly produces offspring that are genetically very similar to the single parent.
Reason (R): It involves one parent and does not include the fusion of gametes.
Reason (R): It involves one parent and does not include the fusion of gametes.
Answer: (a)
Both A and R are true, and R is the correct explanation of A. Without gamete fusion and genetic mixing from two parents, the offspring are generally near-identical copies.
2
Assertion (A): Sexual reproduction can generate new combinations of parental characteristics.
Reason (R): Budding, spore formation, and vegetative propagation are forms of asexual reproduction.
Reason (R): Budding, spore formation, and vegetative propagation are forms of asexual reproduction.
Answer: (b)
Both A and R are true, but R is NOT the correct explanation of A. The reason correctly lists asexual methods but does not explain variation in sexual reproduction.
3
Assertion (A): Hydra can reproduce asexually by budding.
Reason (R): A hydra bud begins when male and female gametes fuse on the parent's body.
Reason (R): A hydra bud begins when male and female gametes fuse on the parent's body.
Answer: (c)
A is true, but R is false. The bud develops by mitotic growth from the parent and does not require gamete fusion.
4
Assertion (A): Yeast reproduces asexually only by binary fission.
Reason (R): Budding is a common mode of asexual reproduction in yeast.
Reason (R): Budding is a common mode of asexual reproduction in yeast.
Answer: (d)
A is false, but R is true. Yeast commonly forms a small bud that grows and separates from the parent cell.
5
Assertion (A): A potato can produce new plants through vegetative propagation.
Reason (R): Its underground stem bears buds that can sprout into shoots and roots.
Reason (R): Its underground stem bears buds that can sprout into shoots and roots.
Answer: (a)
Both A and R are true, and R is the correct explanation of A. The buds on the tuber allow a new plant to grow without seed formation.
6
Assertion (A): Tissue culture can rapidly produce many healthy plantlets with desirable characteristics.
Reason (R): Sexual reproduction generally creates more variation than asexual reproduction.
Reason (R): Sexual reproduction generally creates more variation than asexual reproduction.
Answer: (b)
Both A and R are true, but R is NOT the correct explanation of A. Both are true, but the contrast in variation does not explain how tissue culture enables rapid mass propagation.
7
Assertion (A): Grafting joins a stem portion of one plant to a rooted plant so that they grow together.
Reason (R): All new plants produced by grafting must first develop from seeds.
Reason (R): All new plants produced by grafting must first develop from seeds.
Answer: (c)
A is true, but R is false. Grafting is a vegetative method and does not require seed formation.
8
Assertion (A): Asexual reproduction normally creates greater genetic variation than sexual reproduction.
Reason (R): Meiosis and the combination of gametes can produce variation in sexually formed offspring.
Reason (R): Meiosis and the combination of gametes can produce variation in sexually formed offspring.
Answer: (d)
A is false, but R is true. Sexual reproduction, rather than asexual reproduction, is the major source of new combinations of traits.
9
Assertion (A): Meiosis helps maintain the chromosome number of a species across sexual generations.
Reason (R): It produces gametes with half the parental chromosome number, which is restored at fertilisation.
Reason (R): It produces gametes with half the parental chromosome number, which is restored at fertilisation.
Answer: (a)
Both A and R are true, and R is the correct explanation of A. Reduction during gamete formation and restoration during fusion prevent chromosome number from doubling each generation.
10
Assertion (A): A flower contains reproductive structures such as stamens and a pistil.
Reason (R): Petals can help attract animal pollinators to a flower.
Reason (R): Petals can help attract animal pollinators to a flower.
Answer: (b)
Both A and R are true, but R is NOT the correct explanation of A. Both statements are correct, but pollinator attraction does not explain why stamens and pistil are reproductive structures.
11
Assertion (A): Pollination must occur before fertilisation can take place in a flowering plant.
Reason (R): During pollination, the pollen tube carries the egg from the ovule to the stigma.
Reason (R): During pollination, the pollen tube carries the egg from the ovule to the stigma.
Answer: (c)
A is true, but R is false. Pollination transfers pollen to the stigma; afterward, a pollen tube carries male gametes toward the ovule.
12
Assertion (A): The anther is the female part of a flower that receives pollen.
Reason (R): The pistil is the female reproductive structure and includes the stigma, style, and ovary.
Reason (R): The pistil is the female reproductive structure and includes the stigma, style, and ovary.
Answer: (d)
A is false, but R is true. The anther is part of the male stamen and produces pollen.
13
Assertion (A): Cross-pollination transfers pollen between flowers of different plants of the same species.
Reason (R): This transfer can combine genetic material from two different plants and increase variation.
Reason (R): This transfer can combine genetic material from two different plants and increase variation.
Answer: (a)
Both A and R are true, and R is the correct explanation of A. The involvement of distinct parent plants accounts for the greater opportunity for genetic mixing.
14
Assertion (A): Self-pollination and cross-pollination both transfer pollen to a receptive stigma.
Reason (R): After fertilisation, the ovule develops into a seed.
Reason (R): After fertilisation, the ovule develops into a seed.
Answer: (b)
Both A and R are true, but R is NOT the correct explanation of A. The seed-development statement is true but does not explain what the two types of pollination share.
15
Assertion (A): After fertilisation in a flower, the ovule develops into a seed and the ovary develops into a fruit.
Reason (R): After fertilisation, the stigma develops into the fruit and the ovary becomes the seed.
Reason (R): After fertilisation, the stigma develops into the fruit and the ovary becomes the seed.
Answer: (c)
A is true, but R is false. The reason reverses and misassigns the structures that form the seed and fruit.
16
Assertion (A): In humans, fertilisation normally takes place in the uterus.
Reason (R): The fusion of sperm and egg usually occurs in an oviduct before the early embryo reaches the uterus.
Reason (R): The fusion of sperm and egg usually occurs in an oviduct before the early embryo reaches the uterus.
Answer: (d)
A is false, but R is true. The uterus is principally the site of implantation and development, not the usual site of fertilisation.
17
Assertion (A): Implantation begins after the early embryo reaches the uterus.
Reason (R): The uterine lining becomes thick and well supplied with blood to support development.
Reason (R): The uterine lining becomes thick and well supplied with blood to support development.
Answer: (a)
Both A and R are true, and R is the correct explanation of A. The prepared lining provides the site and resources needed for implantation and subsequent growth.
18
Assertion (A): Condoms can help prevent pregnancy and reduce the spread of sexually transmitted infections.
Reason (R): Copper-T is an intra-uterine contraceptive device.
Reason (R): Copper-T is an intra-uterine contraceptive device.
Answer: (b)
Both A and R are true, but R is NOT the correct explanation of A. Both statements are correct, but identifying another contraceptive method does not explain the dual protection provided by condoms.
19
Assertion (A): Good nutrition, medical check-ups, and avoidance of harmful substances support a healthy pregnancy.
Reason (R): Alcohol, tobacco, and harmful drugs are safe for the developing baby when used in small amounts.
Reason (R): Alcohol, tobacco, and harmful drugs are safe for the developing baby when used in small amounts.
Answer: (c)
A is true, but R is false. Such substances may harm development and should be avoided according to medical guidance.
20
Assertion (A): The menstrual cycle continues in its usual form throughout pregnancy.
Reason (R): When pregnancy begins, hormones maintain the uterine lining rather than allowing it to be shed.
Reason (R): When pregnancy begins, hormones maintain the uterine lining rather than allowing it to be shed.
Answer: (d)
A is false, but R is true. Maintenance of the uterine lining causes menstruation to stop during pregnancy.
❓ Frequently Asked Questions
What is covered in CBSE Class 9 Science Chapter 11 Reproduction: How Life Continues?
This chapter covers all key topics from Reproduction: How Life Continues as per CBSE 2026-27 syllabus.
Is this Assertion & Reason useful for CBSE board exams?
Yes, designed for CBSE Class 9 board exam preparation covering the complete syllabus.
Are these CBSE Class 9 Science Assertion & Reason updated for 2026-27?
Yes, all content at eBookPublisher is updated as per the latest 2026-27 CBSE syllabus.
How many chapters are in CBSE Class 9 Science?
All chapters of CBSE Class 9 Science are covered at eBookPublisher with free Assertion & Reason for each chapter.
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