Ncert Exemplar Solutions Class 8 Science Reproduction in Animals

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Ncert Exemplar Solutions Class 8 Science Reproduction in Animals

Welcome to NCTB Solutions. Here with this post we are going to help 8th class students for the Solutions of NCERT Exemplar Class 8 Science Book, Unit 9, Reproduction in Animals. Here students can easily find step by step solutions of all the problems for Reproduction in Animals, Also here our Science teacher’s are solved all the questions with easily understandable language with proper guidance so that all the students can understand easily.

Reproduction in Animals all Question Solutions :

Multiple Choice Questions :

Question no – (1)

Sets of reproductive terms are given below. Choose the set that has an incorrect combination.

Answer :

Correct option – (c)

The set that has an incorrect combination is sperm, oviduct, egg, uterus.

Question no – (2)

In humans, the development of fertilised egg takes place in the

Answer :

Correct option – (b)

In humans the development of fertilised egg takes place in the Testis.

Question no – (3)

In the list of animals given below, hen is the odd one out.

Answer :

Correct option – (b)

The reason for this is it is oviparous.

Question no – (4)

Animals exhibiting external fertilisation produce a large number of gametes. Pick the appropriate reason from the following

Answer :

Correct option – (c)

Appropriate reason : To ensure better chance of fertilisation.

Question no – (5)

Reproduction by budding takes place in.

Answer :

Correct option – (a)

Reproduction by budding takes place in hydra.

Question no – (6)

Which of the following statements about reproduction in humans is correct?

Answer :

Correct option – (d)

The correct statement – Fertilisation takes place in the human female.

Question no – (7)

In human beings, after fertilisation, the structure which gets embedded in the wall of uterus is

Answer :

Correct option – (b)

The structure which gets embedded in the wall of uterus is Embryo.

Question no – (8)

Aquatic animals in which fertilisation occurs in water are said to be

Answer :

Correct option – (b)

It’s called Oviparous with external fertilisation.

Question no – (9)

After fertilisation, the resulting cell which gives rise to a new individual is the

Answer :

Correct option – (d)

The resulting cell which gives rise to a new individual is the Zygote.

Question no – (10)

In human beings, the correct sequence of events during reproduction is

Answer :

Correct option – (a)

The correct sequence – gamete formation, fertilisation, zygote, embryo.

Very Short Answer Questions :

Question no – (12)

Answer :

The stage of a Silkworms’s life cycle in sequential order is eggs, silkworms, pupa, silkmoth.

Question no – (13)

Answer :

Importance of reproduction :

Reproduction is very essential for the continuation of a species. When animals reproduce they produce their kind which ensures that their kind will survive without the threat of extinction.

Question no – (14)

Answer :

The eggs of dogs are not available in market because they are viviparous animals. They have eggs inside their body but they don’t lay it outside, instead they give birth to young ones.

Question no – (15)

Answer :

A frogs eggs is covered by a jelly like substance which holds the eggs together and protects it from physical damage. So it’s does not requires any hard coverings like in hen’s egg.

Short Answer Questions :

Question no – (16)

Answer :

Amoeba is a Single celled organism. It reproduces by A sexual reproduction. The process of reproduction begins by the division of its Nucleus into two. This is followed by the division of its Body into two. This type of reproduction is called Binary fission.

Question no – (17)

Answer :

A human’s baby in her mother’s womb has already developed all its body parts and at the time of birth there is no drastic changes in its body parts. While in metamorphosis the young one will experience drastic changes in its body parts. So metamorphosis term is not used with human development.

Question no – (18)

Answer :

A mother’s gamete is fertilized by a father’s gamete which then develops to became a zygote. Since the zygote has cells from both father and mother so it contains hereditary characters of both the parents irrespective of the fact that only mother give births.

Question no – (19)

Answer :

A hydra reproduces by the process of budding that is some of the bulges in its body parts develops to became a new hydra. While an amoeba reproduces by the process of binary fission that is an amoeba divides its nucleus into two parts followed by the splitting of its body into two parts. Each of these body parts receives a nucleus and forms a new amoeba.

Question no – (20)

Answer :

(a) External fertilisation can occur both in water and on land.

This statement is False.

Reason : External fertilization occurs in water only.

(b) The eggs of fish are covered by hard shells for protection

This statement is False.

Reason : The eggs of fish are covered by a jelly like substance.

(c) Human egg has a head, middle piece and tail

This statement is False.

Reason : Human sperm has a head, middle piece and a tail.

(d) In adult human females, a single mature egg is released into an oviduct every month

This statement is True.

Question no – (21)

Answer :

Only male gametes have tails because they have to have and make their way to stationary female gametes.

Question no – (22)

Answer :

This figure us showing an amoeba which is producing a new amoeba by undergoing Binary fission.

Question no – (23)

Answer :

(a) Label A and B.

= A – sperm, B – ovum

(b) Identify the process.

= It is Fertilization.

(c) What happens during this process and what is formed?

= During this process the male sperm fuses with the female egg to form a zygote.

Long Answer Questions :

Question no – (24)

Answer :

A female fish lays eggs in water, the male fish also releases thousands of sperms into the water. These sperms then move randomly inside water making its way to the female eggs. This result in the fertilization of the female eggs which grows and develops into new ones. Since this whole process takes place outside the fishes body we can say that is an external form of reproduction.

Question no – (25)

Answer :

(i) The part which produces female gametes.

= Ovary.

(ii) The part where development of the baby takes place.

= Oviduct.

(iii) The part through which the developing embryo passes to reach the uterus.

= Uterus.

(b) Explanation :

The embryo when it’s get embedded into the the wall of the uterus continues to grow in the uterus. Here the embryo develops body parts such as hands, legs, head, eyes, etc. This stage is referred to as foetus as the body parts are clearly distinguishable. After the completion of the foetus the mother give birth to a baby.

Question no – (26)

Answer :

Hens and frogs are both oviparous but exhibiting different types of fertilizations. On one side fertilization of hen’s egg occurs inside the hen’s body that is the growth of embryo takes place inside the body. While on the other hand fish lays eggs in the water and the full process from upto fertilization to birth takes place outside the fish body.

Question no – (27)

Answer :

(a) The embryo gets embedded in the uterus wall

(b) Fertilization of a human egg

(c) Zygote formation and development of an embryo from the zygote

(d) Formation of zygote.

(ii) Arrange the stages in correct sequence of development.

= The stages arranged in correct sequence or in order of their occurrence are b , d , c and a.

(iii) Explain the development that takes place in any one stage.

= In stage d the nucleus of the human sperm fuses with the female egg to form a single nucleus. This stage is the formation of a Zygote.

Other Chapter Solutions :

👉 Crop Production and Management