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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