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a
immediately after the sperm enters the vagina.
b
when sperm comes in contact with cervix.
c
when sperm comes in contact with the ovum.
d
immediately after the sperm enters the oviduct.
answer is C.
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Detailed Solution
The acrosomal reaction takes place when the sperm comes in contact with the ovum (secondary oocyte). The secretions of the acrosome help the sperm enter into the cytoplasm of the ovum through the zona pellucida and the plasma membrane.