NCERT Solutions for Class 8 Chapter 9: Reproduction in Animals

NCERT Solutions for Class 8 Chapter 9 Reproduction in Animals is very important from the exam point of view, these NCERT Solutions are the answers to the questions given in the back exercises of Class 8 Chapter 9, from the solutions of these questions you will gain knowledge. You will get to know why reproduction is necessary for living beings and how the process of reproduction takes place. Reproduction is a process in organisms that perpetuates their species, reproduction is an important way of survival of a particular species. If it is not carried out by any living being, life on earth will cease to exist.

NCERT Solutions for Class 8 Chapter 9 : Reproduction in Animals

Q1.Explain the importance of reproduction in organisms.

Ans. Reproduction is essential for the continuation of species. Reproduction is very important as it ensures the continuation of similar kinds of individuals, generation after generation.

Q2.Describe the fertilization process in human beings.

Ans. The process of reproduction initiates from the fusion of a sperm and an ovum(i.e egg). When sperms come in contact with an egg, one of the sperms may fuse with the egg, in the process of fusion the nuclei of sperm and egg form a single nucleus, such fusion of sperm and egg is known as fertilization. This results in the formation of fertilized egg which is called the zygote.

Q3.Choose the appropriate answer.

(a)Internal fertilization occurs

(i)In the female body

(ii)Outside female body

(iii)In the male body

(iv)Outside male body

Ans.(i)In the female body

(b)A tadpole develops into an adult frog by the process of

(i)fertilization (ii)metamorphosis  (iii)embedding (iv)budding

Ans.(ii)metamorphosis

(c)The number of nuclei present in a zygote is

(i) none  (ii)one   (iii)two    (iv)four

Ans.(iii)two

Q4.Indicate whether the following statements are True(T) or False(F).

(a)Oviparous animals give birth to young ones.

(b)Each sperm is a single cell.

(c)External fertilization takes place in frog.

(d)A new human individual develops from a cell called a gamete.

(e)Egg laid after fertilization is made up of a single cell.

(f)Amoeba reproduces by budding.

(g)Fertilization is necessary even in asexual reproduction.

(h)Binary fission is a method of asexual reproduction.

(i)A zygote is formed as a result of fertilization.

(j)An embryo is made up of a single cell.

Ans.

a)Oviparous animals give birth to young ones.(T)

(b)Each sperm is a single cell.(T)

(c)External fertilization takes place in frog.(T)

(d)A new human individual develops from a cell called a gamete.(T)

(e)Egg laid after fertilization is made up of a single cell.(T)

(f)Amoeba reproduces by budding.(F)

(g)Fertilization is necessary even in asexual reproduction.(F)

(h)Binary fission is a method of asexual reproduction.(T)

(i)A zygote is formed as a result of fertilization.(T)

(j)An embryo is made up of a single cell.(F)

Q5.Give two differences between a zygote and foetus.

Ans.Zygote: The formation of the zygote is the first stage of fertilization. The sperm cell fused with an egg cell give rise to the formation of the zygote,zygote repeatedly divides and develops into an embryo where cells begin to form different groups.

Foetus: It is not part of fertilization. the foetus develops from an embryo when all the body parts can be seen then it is known as a foetus. The foetus is developed within a month after fertilization takes place.

Q6.Define asexual reproduction. Describe two methods of asexual reproduction in animals.

Ans. The type of reproduction in which only a single parent is involved is called asexual reproduction. Asexual reproduction occurs in small animals and microorganisms. Two methods of reproduction are budding and fission.

(i)Budding: The body surface of a creature like a hydra, yeast have bulges in their body, these bulges are known as buds, from these buds new individuals are developed and after getting maturity separated from the parent’s body, this method of reproduction is called budding.

(ii)Binary Fission: Binary fission occurs in microorganisms like amoeba. The way of reproduction in which single nuclei of a single-celled organism is divided into two nuclei is followed by the division of its body into two.

Q7.In which female reproductive organ does the embryo get embedded?

Ans. Embryos get embedded in the walls of the uterus.

Q8.What is metamorphosis? Give examples.

Ans. In some of the animals, the stages of growth are distinct from each other while growing from young to adult. The features of a young one and an adult are quite different, for example, the stages in the growth of frogs from young to adult are egg, larva(tadpole) and adult, and the tadpole appears different from the adult. The transformation of a larva to an adult through drastic changes is known as the process of metamorphosis.

Q9.Differentiate between internal fertilization and external fertilization.

Ans. Fertilization among animals occurs in two ways internal fertilization which takes place inside the female body for example animals that give direct birth to young ones like humans, cows etc. and external fertilization which occurs outside of the female body, In external fertilization, the fusion of male and female gametes takes place outside the body of the female. For example, a female frog lays eggs in water and the male sprays them with sperms, the sperms come into contact with the egg cell, resulting in fertilization. External fertilization occurs in aquatic animals like fish, starfish etc.

Q10.Complete the crossword puzzle using the hint given below.

Crossword

1. The process of fusion of gametes

6. The type of fertilization in the hen

7. The term used for bulges observed on the sides of the body of Hydra.

8. Eggs are produced here

Down

2. Sperms are produced in these male reproductive organs

3. Another term for Vitro fertilization

4. These animals lay eggs

5. A type of fission in amoeba

Ans.Crossword

1. Fertilization

6. External fertilization

7. Buds

8. Ovary

Down

2. Testis

3. IVF

4. Oviparous

5. Binary

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