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03/01/2022 6:26 pm
Topic starter
Choose the incorrect statement from the following:
(a) In birds and mammals internal fertilisation takes place.
(b) Colostrum contains antibodies and nutrients.
(c) Polyspermy in mammals is prevented by the chemical changes in the egg surface.
(d) In the human female implantation occurs almost seven days after fertilisation.
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03/01/2022 6:27 pm
Correct answer: (c) Polyspermy in mammals is prevented by the chemical changes in the egg surface.
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.