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Answer: 4. Zona pellucida

In mammals, sperm-binding receptors are present on the zona pellucida, the glycoprotein layer around the ovum. Binding triggers the acrosomal reaction. Corona radiata is a layer of follicle cells; vitelline membrane is the egg's plasma membrane in non-mammals.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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