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Biology · 2024 · 3 marks
CBSE 2024 · Region 3 · Set 2 · Q22
(a) Draw a diagram of a human sperm. Label the following parts in it: (i) Which helps in the motility of the sperm (ii) Which helps in penetrating…
(a)
Draw a diagram of a human sperm. Label the following parts in it :
(i)
Which helps in the motility of the sperm
(ii)
Which helps in penetrating through the corona radiata and zona pellucida
(iii)
Which enters into the cytoplasm of the human egg
(b)
Mention how is polyspermy prevented during the course of fertilization in humans.
Marking-scheme solution
(a)(i)
Middle piece + tail
(ii)
Acrosome
(iii)
Head
(b)
Sperm coming in con
in the membrane, that block
fertilizes the ovum.
act with the zona pellucida layer of ovum and induces changes the entry of additional sperm thus, ensures that only one sperm
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CBSE Class 12 Biology past-paper question from the 2024 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.