Question

1. Choose the incorrect statement from the following:
(1) In birds and mammals internal fertilization takes
place
(2) Colostrum contains antibodies and nutrients

(3) Polyspermy in mammals is prevented by the
chemical changes in the egg surface
(4) In the human female implantation occurs almost
seven days after fertilization.
Identify the correct statement from the following:​

Answer 1

Answer:

3) Polyspermy in mammals is prevented by the

Answer 2

Answer:

c

Explanation:

During fertilisation, a sperm comes in contact with the zona pellucida layer of the ovum and induces changes in the membrane that block the entry of additional sperms. Thus, it ensures that only one sperm can fertilise an ovum.