Teaching UP TGT Mock Test Series 2025 General Science Biology Zoology

The fast block to polyspermy occurs due to the:

1
Inactivation of binding receptors on the vitelline membrane
2
Influx of Na+ and the out flux of Ca+
3
Influx of Na+ and depolarization of ovum membrane
4
Outflux of Na+ and depolarization of ovum membrane
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