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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
Answers (1)
The answer is the option (c) Polyspermy in mammals is prevented by the chemical changes in the egg surface
Explanation: Zona pellucida absorbs water and swells preventing further entry of sperms. So, physical change rather than chemical change is responsible for the prevention of polyspermy in mammals.
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