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Mention the function of (a) Zona pelluci...

Mention the function of (a) Zona pellucida (b) Coleorhiza

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(a) Zona pellucide- It allows the entry of one sperm into the cytoplasm of the ovum and then undergoes changes to prevent entry of additional sperms.
(b) Coleorhiza- The radicle and root cap are situated at the lower end of embryonal axis in an undifferentiated sheath called coleorhiza.
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