Class 10 Science · Chapter 7

How do Organisms Reproduce?

185 Class 10 Science questions on How do Organisms Reproduce? from the NCERT textbook, NCERT Exemplar and CBSE board papers 2024–2026, each with its answer and a step-by-step solution.

NCERT exercises

Exercises (11) Intext Questions (Page 114) (2) Intext Questions (Page 119) (5) Intext Questions (Page 126) (5)

NCERT Exemplar exercises

Multiple Choice Questions (27) Short Answer Questions (21) Long Answer Questions (10)

CBSE Class 10 Science previous year papers, with answers →

Questions · page 5 of 10

Q81 Exemplar · Long Answer Questions

Describe sexually transmitted diseases and mention the ways to prevent them.

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Diseases spread mainly by sexual contact (gonorrhoea, syphilis, warts, HIV-AIDS); prevented by condoms, one uninfected partner, screened blood and sterile needles.
Sexually transmitted diseases, also called sexually transmitted infections, are diseases caused by pathogens that pass from an infected person to a healthy one mainly during the sexual act, because that act brings the two bodies into very close contact and involves the exchange of body fluids. Some of them are bacterial: gonorrhoea and syphilis are the common examples, and both can be cured by antibiotics if they are diagnosed and treated early. Others are viral: warts, caused by the human papilloma virus, and HIV-AIDS, caused by the human immunodeficiency virus. Antibiotics have no effect on viruses, and HIV infection has no cure. Untreated bacterial infections cause pain, discharge and ulcers, can spread to the reproductive organs and leave both men and women infertile, and syphilis can damage many organs if it is left untreated. HIV infects and destroys the cells of the immune system, so over several years the body loses its ability to fight infection and the person suffers repeated infections that a healthy person would resist; this condition is AIDS. These infections also spread by other routes: through infected blood and blood products, through needles and syringes used by more than one person, and from an infected mother to her child during pregnancy, at birth or through breast-feeding. They are prevented by blocking those routes. Using a mechanical barrier, a condom, during the sexual act stops the exchange of body fluids and lowers the risk for both partners, and keeping to a single uninfected partner reduces the chance of meeting an infected person at all. Blood for transfusion must be screened, and needles and syringes must be sterile and used once only and never shared. Pregnant women should be tested and treated so that the infection is not passed on to the baby, and a vaccine exists against the human papilloma virus that causes warts. Early diagnosis and treatment of both partners cures the bacterial infections and stops them being passed on further, whereas treating one partner alone leads to re-infection. Finally, accurate awareness matters, because these diseases are not spread by shaking hands, hugging, sharing food or utensils, using the same toilet, or living and working beside an infected person, and an infected person therefore need not be avoided or isolated.

Step-by-step solution →
Q82 CBSE 2026
If the part 'P' of the flower is removed, which of the following processes will not take place ?
1. (a)Formation of pollens
2. (b)Formation of flower
3. (c)Formation of fruit
4. (d)Formation of seed
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(c) Formation of fruit

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Q83 CBSE 2026
Identify the type of reproduction shown in the diagram given below :
1. (a)Budding
2. (b)Fragmentation
3. (c)Spore Formation
4. (d)Binary Fission
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(d) Binary Fission

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Q84 CBSE 2026
Yeast multiplies by which of the following methods ?
1. (a)Fragmentation
2. (b)Binary Fission
3. (c)Multiple Fission
4. (d)Budding
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(d) Budding

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Q85 CBSE 2026
Which of the following statements correctly identify the advantages of vegetative propagation ?
1. (i)Plants can bear flowers and fruits earlier than those produced by seeds.
2. (ii)The new plants develop as an outgrowth on the parent plant and can be removed easily.
3. (iii)Plants that have lost the capacity to produce seeds can be propagated.
4. (iv)All plants produced are genetically similar to parent plant.
1. (a)(i), (iii), (iv)
2. (b)(ii), (iii), (iv)
3. (c)(i), (ii), (iii)
4. (d)(ii), (iv) only
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(a) (i), (iii), (iv)

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Q86 CBSE 2026
Identify the correct statement for spirogyra, leishmania and hydra :
1. (a)they reproduce sexually.
2. (b)they are unicellular.
3. (c)they are multicellular.
4. (d)they reproduce asexually.
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(d) they reproduce asexually.

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Q87 CBSE 2026
A farmer wants to grow banana plants genetically similar to the plants already available in the fields. Which of the following method would you suggest for this purpose :
1. (a)Regeneration
2. (b)Budding
3. (c)Vegetative propagation
4. (d)Sexual reproduction
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(c) Vegetative propagation

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Q88 CBSE 2026
Spirogyra, despite being a multi-cellular organism, still shows a simple reproductive method. Select the correct option with regard to reproduction in Spirogyra :
1. (a)Asexual reproduction by division of cells into two cells
2. (b)Sexual reproduction by division of cells into many cells
3. (c)Asexual reproduction by breaking up of Spirogyra filaments into smaller parts
4. (d)Sexual reproduction by the formation of gametes after meiosis of cells of filaments followed by fusion of male and female gametes
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(c) Asexual reproduction by breaking up of Spirogyra filaments into smaller parts

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Q89 CBSE 2026
In human beings, the implantation of fertilised egg takes place in which part of female reproductive system ?
1. (a)Oviduct
2. (b)Cervix
3. (c)Uterus
4. (d)Vagina
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(c) Uterus

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Q90 CBSE 2026
This freshwater organism is known for its amazing ability to reproduce by any of the two methods – either regeneration or budding. Identify the organism.
1. (a)Amoeba
2. (b)Hydra
3. (c)Plasmodium
4. (d)Planaria
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(b) Hydra

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Q91 CBSE 2026
From the following, identify the sexually transmitted diseases caused by bacteria.
1. (i)Warts
2. (ii)Gonorrhoea
3. (iii)AIDS
4. (iv)Syphilis Choose the correct option :
1. (a)(iii) and (iv)
2. (b)(i) and (iii)
3. (c)(i) and (ii)
4. (d)(ii) and (iv)
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(d) (ii) and (iv)

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Q92 CBSE 2026
Which of the following represents the correct sequence of events of sexual reproduction in a flower ?
1. (a)Pollination, Fertilization, Seed, Embryo
2. (b)Seed, Embryo, Fertilization, Pollination
3. (c)Seed, Plant, Flower, Pollination, Fertilization
4. (d)Pollination, Fertilization, Embryo, Seed
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(d) Pollination, Fertilization, Embryo, Seed

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Q93 CBSE 2026
The number of chromosomes in parents and offspring of a particular species undergoing sexual reproduction remains constant due to :
1. (a)doubling of chromosomes after zygote formation.
2. (b)halving of chromosomes after zygote formation.
3. (c)doubling of chromosomes before gamete formation.
4. (d)halving of chromosomes at the time of gamete formation.
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(d) halving of chromosomes at the time of gamete formation.

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Q94 CBSE 2026
The sexually transmitted disease caused by bacteria is :
1. (a)Diarrhoea
2. (b)AIDS
3. (c)Gonorrhoea
4. (d)Wart
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(c) Gonorrhoea

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Q95 CBSE 2026
Select the option which illustrates the correct method of asexual reproduction in Spirogyra.
1. (a)Budding
2. (b)Regeneration
3. (c)Fragmentation
4. (d)Spore formation
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(c) Fragmentation

Step-by-step solution →
Q96 CBSE 2026
This question consists of two statements — Assertion (A) and Reason (R). Answer the question by selecting the appropriate option from (a), (b), (c) and (d) given below :
Assertion (A): Variations are not often seen in off-springs produced by asexual reproduction.
Reason (R): DNA molecule generated by replication is not similar to the original DNA.
1. (a)Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
2. (b)Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
3. (c)Assertion (A) is true, but Reason (R) is false.
4. (d)Assertion (A) is false, but Reason (R) is true.
Show answer

(c) Assertion (A) is true, but Reason (R) is false.

Step-by-step solution →
Q97 CBSE 2026
For Questions number 8 and 9, two statements are given — one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below.
Assertion (A): In early teenage years, body appearance changes in both boys and girls.
Reason (R): Body undergoes sexual maturity during puberty.
1. (a)Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
2. (b)Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).
3. (c)Assertion (A) is true, but Reason (R) is false.
4. (d)Assertion (A) is false, but Reason (R) is true.
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(a) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).

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Q98 CBSE 2026
Question No. 8 & 9 consists of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option from (a), (b), (c) and (d) given below :
Assertion (A): In regeneration, organisms have the ability to give rise to new individual organisms from their body parts.
Reason (R): Simple animals like Hydra and Planaria show regeneration.
1. (a)Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
2. (b)Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
3. (c)Assertion (A) is true, but Reason (R) is false.
4. (d)Assertion (A) is false, but Reason (R) is true.
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(b) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).

Step-by-step solution →
Q99 CBSE 2026
This question consists of two statements — Assertion (A) and Reason (R). Answer the question by selecting the appropriate option from (a), (b), (c) and (d) given below :
Assertion (A): Reproduction, like any other life process, is essential to maintain the life of an individual organism.
Reason (R): Reproduction involves creation of a DNA copy and additional cellular apparatus by the cell involved in the process.
1. (a)Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
2. (b)Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
3. (c)Assertion (A) is true, but Reason (R) is false.
4. (d)Assertion (A) is false, but Reason (R) is true.
Show answer

(d) Assertion (A) is false, but Reason (R) is true.

Step-by-step solution →
Q100 CBSE 2026
Question No. 8 & 9 consists of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option from (a), (b), (c) and (d) given below :
Assertion (A): Bacteria produced as a result of asexual reproduction would be similar.
Reason (R): There would be only minor differences between the bacteria generated due to small inaccuracies in DNA replication.
1. (a)Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
2. (b)Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
3. (c)Assertion (A) is true, but Reason (R) is false.
4. (d)Assertion (A) is false, but Reason (R) is true.
Show answer

(a) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).

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