Correct Answer: C
Solution :The secretions of the female genital tract make the sperms capable of fertilizing the ovum. These secretions remove the coating substances deposited on the surface of the sperm particularly those on the acrosome. Thus, the receptor sites on the acrosome are exposed and sperm becomes active to penetrate the egg. This phenomenon of sperm activation in mammals is known as capacitation. It takes about 5 to 6 hours for capacitation.
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