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प्रश्न
The human male ejaculates about 200 to 300 million sperm during a coitus, however the ovum is fertilized by only one sperm. How does the ovum block the entry of additional sperms?
एका वाक्यात उत्तर
उत्तर
A sperm induces changes in the zona pellucida membrane on contact, blocking entry of other sperms.
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