REPRODUCTION

How can we say that fish exhibits external fertilisation?

Why do only male gametes have a tail?

State whether the following statements are True or False. If false,
correct the statement:
(a) External fertilisation can occur both in water and on land.
(b) The eggs of fish are covered by hard shells for protection.
(c) Human egg has a head, middle piece and tail.
(d) In adult human females, a single mature egg is released into
an oviduct every month.

How is reproduction in hydra different from that in amoeba?

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

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

Fill up the blanks with the terms given below:
body, asexual, binary, single, nucleus
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 eggs of frogs do not have shells for protection, yet they are
safe in water. How?

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

What is the importance of reproduction?

Explain the importance of reproduction in organisms.

Describe the process of fertilization in human beings.

Choose the most appropriate answer.

(a) Internal fertilization 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) fertilization

(ii) metamorphosis

(iii) embedding

(iv) budding

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

(i) none

(ii) one

(iii) two

(iv) four

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 frogs. ( )

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

Give two differences between a zygote and a foetus.

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

In which female reproductive organ does the embryo get embedded?

What is metamorphosis? Give examples.

Differentiate between internal fertilization and external fertilization.

Complete the crossword puzzle using the hints given below.

Across

1. The process of the fusion of the gametes.

6. The type of fertilization 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 the fertilized egg.

4. These animals lay eggs.

5. A type of fission in amoeba.