Class 12th Biology 2013 Set2 Delhi Board Paper Solution

Question 27

(a) Draw a diagram of the structure of a human ovum surrounded by corona radiata. Label the following parts:
(b) (i) Ovum
(ii) Plasma Membrane
(iii) Zona Pellucida

Answer

(a)

(b) Function of Zona Pellucida

It completely surrounds the ovum and prevents polyspermy.

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