NCERT Exemplar solutions for Science [English] Class 8 chapter 9 - Reproduction in Animals [Latest edition]

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

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

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

The reason for this is

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

Reproduction by budding takes place in

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

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

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

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

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

Although 2 cells called gametes fuse, the product formed is a single cell called zygote. Justify.

Stages in the life cycle of silkworm are given below. Write them in sequential order.

What is the importance of reproduction?

In markets, eggs of birds are available but never eggs of dogs, why?

The eggs of frogs do not have shells for protection, yet they are safe in water, how?

Fill up the blanks with the terms given below :

Amoeba is a ______ celled organism. It reproduces by ______ reproduction.
The process of reproduction begins by the division of its ______ into two.
This is followed by the division of its ______ into two. This type of reproduction is called ______ fission.

The term metamorphosis is not used while describing human development. Why?

Mother gives birth to a baby but the baby has characters of both parents. How is this possible?

How is reproduction in Hydra different from that in Amoeba?

State whether the following statement is True or False. If false, correct the statement :

External fertilisation can occur both in water and on land.

State whether the following statement is True or False. If false, correct the statement :

The eggs of fish are covered by hard shells for protection.

State whether the following statement is True or False. If false, correct the statement :

Human egg has a head, middle piece and tail.

State whether the following statement is True or False. If false, correct the statement :

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

Why do only male gametes have a tail?

What does figure represent?

Observe the given figure and answer the questions that follow.

1. Label A and B.
2. Identify the process.
3. What happens during the process and what is formed?

How can we say that fish exhibits external fertilisation?

After Observing above figure, answer the following,

1. Read the following statements and label them in the figure.
   (i) The part which produces female gametes.
   (ii) The part where development of the baby takes place.
   (iii) The part through which the developing embryo passes to reach the uterus.
2. Explain the future development of the embryo that would take place after it gets embedded in the uterus.

Hens and frogs are both oviparous exhibiting different types of fertilisation. Explain.

Observe the following figures.

(a)	(b)	(c)	(d)

1. Identify the stages (a) to (d) in figure during development of human baby.
2. Arrange the stages in correct sequence of development.
3. Explain the development that takes place in any one stage.