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How do Organisms Reproduce Class 10 NCERT Solutions

NCERT Solutions for How do Organisms Reproduce Class 10 Chapter 7 Science has all the solutions to the questions provided in the NCERT Book of the latest edition.

Students are advised to practice all the questions to get good marks in the board examination.

Textbook NCERT
Class 10
Subject Science
Chapter 7
Chapter Name How do Organisms Reproduce?
CategoryNCERT Solution

Class 10 Science Chapter 7 How do Organisms Reproduce NCERT Solution

How do Organisms Reproduce Intext Questions Page 114

Question 1

What is the importance of DNA copying in reproduction?


DNA copying means DNA replication. It ensure that each daughter cell produced at the end of cell division receives an identical amount of DNA.

Transfer of genetic information from parent to the offspring makes the organisms to have similar function.

Question 2

Why is variation beneficial to the species but not necessarily for the individual?


When variation occurs in a species group they may be able to cope with the drastic conditions that arise in nature, leaving behind the non-variants. The variation which occurs in an individual may not always be beneficial to it.

How do Organisms Reproduce Intext Questions Page 119

Question 1

How does binary fission differ from multiple fission?


Binary fission is the process by which one cell divides into two halves.

Example: Amoeba

How do Organisms Reproduce

Multiple fission is the process by which a single cell divides into multiple numbers of cells.

Example: Plasmodium

How do Organisms Reproduce
Question 2

How will an organism be benefited if it reproduces through spores?


Advantages of reproduction by spores are:

  • The numbers of spores produced are very large
  • The can spread to long distances, and
  • They have thick outer covering present in them which help them to overcome the harsh environmental conditions
How do Organisms Reproduce
Question 3

Can you think of reasons why more complex organisms cannot give rise to new individuals through regeneration?


The reason is the presence of complexity at the organ system level, where all the organs and their functions are interconnected to hold the organism alive.

So it is not possible to completely regenerate the whole individual but some parts such as skin, blood, muscles, etc are regenerated.

Question 4

Why is vegetative propagation practised for growing some types of plants?


The reason are as follows:

  • They are helpful to grow plants which do not produce seeds
  • These methods are cheap
  • They are helpful to grow plants whose seeds are not able to germinate in the soil
  • To preserve the best quality plant and grow its offspring.
Question 5

Why is DNA copying an essential part of the process of reproduction?


DNA copying is essential because DNA carries genetic information present in an individual.

So when DNA is copied it transfers genetic information from parent to the offspring, which helps in normal growth and functioning of the offspring.

How do Organisms Reproduce Intext Questions Page 126

Question 1

How is the process of pollination different from fertilisation?


In pollination, the pollen grains are transferred via a means of transport from the anther to the stigma.

While fertilisation is the fusion of male and female gametes which results in the formation of zygote.

Question 2

What is the role of the seminal vesicles and the prostate gland?


The seminal vesicles and prostate gland provide lubrication which helps in easy movement of sperms, these glands also provide nutrients to sperms in form of fructose, calcium and enzymes.

Question 3

What are the changes seen in girls at the time of puberty?


Changes seen in girls at the time of puberty are:

  • Growth of hairs in genital parts, face, under arms
  • Their hip size increases and body begins to take shape,
  • Size of breast increases,
  • Size of ovary increases, and
  • Menstrual cycle occurs.
Question 4

How does the embryo get nourishment inside the mother’s body?


The embryo gets nourishment by the placenta. The walls of the uterus get thick in width and when the embryo gets attached to it, the outer layer of the uterine wall covers the whole embryo. These walls are richly supplied by the blood vessels.

Placenta is a specialised structure present which has villi which helps in transfer of food, waste and gases in and out from mother to embryo.

Question 5

If a woman is using a copper-T, will it help in protecting her from sexually transmitted diseases?


No, it won’t protect her from STDs, as the device will not be able to prevent fluid contact.

How do Organisms Reproduce Exercise Questions

Question 1

Asexual reproduction takes place through budding in



Question 2

Which of the following is not a part of the female reproductive system in human beings?


C) Vas deferens

Question 3

The anther contains


D) Pollen grains

Question 4

What are the advantages of sexual reproduction over asexual reproduction?


Advantages of sexual reproduction over asexual reproduction are:

  • The offspring will have genetic information of both the parent
  • The offspring can have variation,
  • The offspring can easily adapt to the environmental changes, and
  • The offspring will have more advantages as compared to its parents
Question 5

What are the functions performed by the testis in human beings?


Functions of testis are:

  • Production of sperms,
  • Production of male hormone androgen,
  • Production of testosterone, which is important for development of secondary sexual characters in male
Question 6

Why does menstruation occur?


Menstruation is the normal bleeding coming out from the vagina due to degeneration of the uterine wall which was developed over a cycle of around a month, which is important for the fertilized egg to develop into an individual.

When the egg is not fertilized by the sperm the wall of the uterus degenerates and comes out of the vagina, as they have dense blood supply these blood vessels also degenerates which makes the blood like appearance of the degenerated walls.

Question 7

Draw a labelled diagram of the longitudinal section of a flower


Question 8

What are the different methods of contraception?


Different methods of contraception are:

  • Natural methods
  • Barrier methods
  • Oral contraceptives
  • Implants
  • Surgical methods

In the Natural method: fertilisation is avoided by avoiding mating from 10th to 17th day, as ovum is released and chances of fusion are very high. Also, the penis is removed just before ejaculation from vagina.

In the Barrier method: fertilisation is avoided by using barriers such as condoms for males, diaphragm for females.

Oral contraceptives are present in tablet forms which are used to avoid fertilisation or may prevent the embryo attachment to the uterine wall. Example: Saheli

Implants are devices which are placed in the female reproductive part to prevent entry of sperm. Example: Copper T

In Surgical methods, the Fallopian tube and vas deferens are cut and tied by surgery to prevent release of egg and sperm

Question 9

How are the modes for reproduction different in unicellular and multicellular organisms?


In unicellular organisms generally, asexual mode of reproduction is used, these are fission, budding, spore formation, etc. Where the offspring produced are identical to the parent.

In multicellular organisms, the sexual mode of reproduction is used. In this method, the male and female reproductive units are developed in separate organs respectively.

These units fuse together to form zygote which later develops into an offspring. The offspring has characters of both the parents and has more ability to cope the harsh environment as compared to its parents

Question 10

How does reproduction help in providing stability to populations of species?


Reproduction is the process by which new offspring are formed by the existing ones.

As death occurs in a species it is important to add new ones otherwise the population of species will decline and will result in extinction. Thus, reproduction helps in providing stability to the population of species

Question 11

What could be the reasons for adopting contraceptive methods?


The reasons for adopting contraceptive methods are as follows:

  • To avoid unplanned pregnancy,
  • Maintain age gap between childrens,
  • To avoid sexually transmitted diseases,
  • Population control

Hope NCERT Solutions for Class 10 Science Chapter 7 How do Organisms Reproduce, helps you in solving problems. If you have any doubts, drop a comment below and we will get back to you.