Q.4 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 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 a 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. ( )

a) Oviparous animals give birth to young ones. ( F )
b) Each sperm is a single cell. ( T )
c) External fertilisation takes place in frog. ( T )
d) A new human individual develops from a cell called gamete. ( F )
e) Egg laid after fertilisation is made up of a single cell. ( T )
f) Amoeba reproduces by budding. ( F )
g) Fertilisation 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 fertilisation. ( T )
j) An embryo is made up of a single cell. ( F )

EXPLANATION

1) Oviparous animals are animals that lay their eggs, with little or no other embryonic development within the mother and the young ones are hatched by means of eggs.

2) Sperm is the male reproductive cell or gamete which takes part in sexual reproduction, in the formation of zygote.

3) External fertilization is a mode of reproduction in which a male organism's sperm fertilizes the female organism's ova/egg that is present outside the female body.

4) A new human individual develops from a cell called as zygote which is formed as a result of fusion of sperm and ova/egg.

5) Egg laid after fertilisation is made up of a single cell and this single cell is called as zygote. Zygote is a single cell that divides and forms embryo. With time, embryo divides and differentiates into different body parts, thus forming foetus.

6) Amoeba reproduces by binary fission. It is a type of asexual reproduction in which a single cell(parent cell) divides into two halves(daughter cells) along with their genetic material.

7) Fertilisation is not necessary in asexual reproduction because asexual reproduction occurs with the help of a single parent, which either divides to produce offspring or it grows its offspring on its body and later separates the offspring from its body.

8) Binary fission is a method of asexual reproduction. It is a type of asexual reproduction in which a single cell(parent cell) divides into two halves(daughter cells) along with their genetic material.

9) A zygote is formed as a result of fertilisation. Zygote is a single cell that divides and forms embryo. With time, embryo divides and differentiates into different body parts, thus forming foetus.

10) An embryo is a result of continuous division of zygote. Hence embryo is made up of many cells.