CBSE Class 12-science Answered
(a)
Draw a diagram of the structure of a human ovum surrounded by corona radiata,
label the following parts:
(i)
Ovum (ii) Plasma membrane (iii) Zona pellucida
(b)
State the function of zona pellucida.
Asked by Topperlearning User | 11 Jun, 2014, 04:16: PM
Expert Answer
(a) Structure of a human ovum
(b) Function of zona pellucida:
A capacitated sperm passes through the corona radiate to reach the zona pellucida. One of the glycoproteins of zona pellucida, ZP3 functions as a sperm receptor and binds a complementary molecule on the surface of the sperm head. Binding of the sperm head to the receptor molecule ZP3 induces the acrosome reaction of the sperm to release its hydrolytic enzymes by exocytosis.
Answered by | 11 Jun, 2014, 06:16: PM
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