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Class 8 Science NCERT Chap 9 Solution

 CHAPTER 9 

REPRODUCTION IN ANIMALS

Chapter 9  REPRODUCTION IN ANIMALS of SCIENCE NCERT of CLASS 8 complete solution and some important points are given. This will help student to understand the topics of CHAPTER 9 REPRODUCTION IN ANIMALS of Class 8. Students can solve the textbook Questions easily and understand all the important points of chapter.

Important points:- 

a) Asexual Reproduction:- The mode of reproduction in which single parent is taking place is known as Asexual Reproduction.

b) Binary fission:- This is a kind of asexual Reproduction in which parent cell split (divide)  into two daughter cells is known as Binary fission.

c) Budding:- In hydra, new individual develop from bud. This method of asexual reproduction is known as Budding.

d) Eggs:- Eggs are female reproductive gametes.

e) Embryo:- Developing stage of zygote is called embryo.

f) External Fertilisation:- When the fertilisation take place outside from the female body is known as External Fertilisation.

g) Fertilisation:- Fusion of male and female gametes is called Fertilisation.

h) Foetus:- Completely developed stage of an embryo in which all body parts completely developed identifiable is called Foetus.

i) Internal Fertilisation:- When the fertilisation take place inside the female body is called internal fertilisation.

j) Metamorphosis:- The transformation of earlier stage to post stage through drastic changes is called Metamorphosis.

k) Oviparous  animals:- Animals which are laying eggs are known as Oviparous animals.

l) Sexual reproduction:- Reproduction in which both male and female take part is known as sexual Reproduction.

m) Sperms:- Male reproductive gamete.

n) Viviparous animals:- Animal which are giving birth to young ones are known as Viviparous animals.

o) Zygote:- Fertilised egg is known as Zygote.

These are the important points about the Chapter 9 REPRODUCTION IN ANIMALS it helps students to understand the chapter.

The solution of textbook questions of Chapter 9 REPRODUCTION IN ANIMALS of Class 8 is given below.

Ques 1. Explain the importance of reproduction in organism.
Ans. a) Reproduction is essential for the continuation of species.
b) Reproduction is essential for the continuation of similar kind of individual generation after generation.
c) Reproduction ensures the survival of all living things.

Ques 2. Describe the process  of fertilisation in human beings.
Ans. Fertilisation is the process by which the nucleus of a sperm fuses with the nucleus of an egg. In human fertilisation occur in the fallopian tube of the female reproductive tract. Such fusion of the egg and the sperm is called fertilisation. Once the head of the sperm is inside the egg and the tail of the sperm off. A Fertilised egg cell is known as Zygote.

REPRODUCTION IN ANIMALS



Ques 3. Choose the most appropriate answer.

a) Internal fertilisation occurs.
(i)  in female body.
(ii) outside female body.
(iii) in male body.
(iv) outside male body.

 b) A tadpole develops into an adult frog by the process of
(i) Fertilisation
(ii) metamorphosis
(iii) embedding
(iv) budding

c) The number of nuclei present in a zygote is 
(i) none
(ii) one 
(iii) two
(iv) four

Ans. a) in female body
b) metamorphosis
c)one

Ques 4. Indicate whether the following  statement are True (T) or False (F).
(a) Oviparous animals give birth to young ones.
(b) Each sperm is a single cell.
(c) External fertilisation takes place in frog.
(d) A new human individual develops from a cell called gamete.
(e) Egg laid after fertilisation is made up of single cell.
(f) Amoeba reproduces by budding.
(g) Fertilisation is necessary even in asexual reproduction.
(h) Binary fission is a method of asexual reproduction.
(i) A zygote is formed as a result of fertilisation.
(j) An embryo is made up of a single cell.

Ans.(a) False
(b) True
(c) True
(d) False
(e) True
(f) False
(g)False
(h)True
(i) True
(j)False

Ques 5. Give two differences between a zygote and a foetus.
Ans. Zygote
a) Fertilised ovum is called Zygote.
b) It is singled celled.
c) It is earliest stage of development.
d) It is formed by the fusion of male and female gametes.
e) The zygote divide several times to form an embryo.

Foetus
a) The stage of the embryo in which all parts of body can be identified is called Foetus.
b) It is multicellular.
c) It is the last developmental stage of an organism.
d) The foetus stage occurs after the embryo stage.
e) Foetus mainly undergoes internal change.

Ques 6. Define asexual reproduction. Describe two methods of asexual reproduction in animals.
Ans. Asexual Reproduction :- Reproduction that involve only a single parent is called asexual reproduction. It occurs with out the union of male and female gametes.
Budding and Binary fission are method of asexual reproduction in animals.

a) Budding:- Hydra reproduces by budding. Small budges  develop on hydra as buds and later form new individual. 

b) Binary fission :- This is a kind of asexual reproduction in which parent cell split(divide) into two daughter cell is known as Binary fission.
REPRODUCTION IN ANIMALS



Ques 7. In which female reproductive organ does the embryo get embedded?

Ans. The embryo get embedded in the female reproductive organ called uterus.

Ques 8. What is metamorphosis? Give example.
Ans. The transformation of the larva into an adult through drastic changes is called metamorphosis.
For example:- Silkworm and frog.
REPRODUCTION IN ANIMALS



Ques 9. Differentiate between internal fertilisation and external fertilisation.
Ans. Internal fertilisation
a) It occurs inside the female body.
b) Gametes are released by adults into a female reproductive tract.
c) Less number of offspring.
d) Example - Mammals, reptilr,birds, worms and insect.
External Fertilisation
a) The eggs and sperms come together outside of the parent bodies.
b) Gametes are released by adults into the water.
c) More number of offspring.
d) star fish, frog and many fishes.

Crossword Puzzle on Reproduction in Animals

10. Complete the crossword puzzle using the hints given below.

Across

1. The process of the fusion of the gametes.

6. The type of fertilisation in 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 in vitro fertilisation.

4. These animals lay eggs.

5. A type of fission in amoeba

Crossword Puzzle on Reproduction in Animal-1

Soln:

Across

1) Fertilization

6) Internal

7) Buds

8) Ovary

Down

2) Testis

3) Zygote

4) Oviparous

5) Binary


This is the complete solution of CHAPTER 9 Reproduction in Animals. This is according to latest syllabus of CBSE 2020-21.

Here's some extra questions are given according to CHAPTER 9 Reproduction in Animals of class 8 Science NCERT.


Ques 1. What is IVF?

Ans. IVF is in-vitro fertilisation. This process have been taking place outside of female body in which zygote form by the artificial method and develop for a week after it place in mothers uterus and take birth as a normal baby. This process is also know as Test Tube Baby.


Ques 2. How do zygote form?

Ans. When sperms enters in female body and reach to uterus one sperms fuse with egg cell and form a zygote.

Ques 3. Write the name of all reproductive parts of male and female bodies.
Ans. Male.                        Female
a) Penis.                          a) Oviduct
b) Testis.                          b) Ovary
c)Sperm duct.                 c) Uterus

These are some extra Questions of Chapter 9 REPRODUCTION IN ANIMALS of class 8 Science NCERT.


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