NEET 2011 · Class 12

Human Reproduction

What happens during fertilization in humans after many sperms reach close to the ovum?

  1. (A)Secretions of acrosome helps one sperm enter cytoplasm of ovum through zona pellucida.
  2. (B)All sperms except the one nearest to the ovum lose their tails.
  3. (C)Cells of corona radiata trap all the sperms except one.
  4. (D)Only two sperms nearest the ovum penetrate zona pellucida.

The NCERT line that answers it

Verbatim line

The secretions of the acrosome help the sperm enter into the cytoplasm of the ovum through the zona pellucida and the plasma

Chapter
Human Reproduction
Section
2.5 FERTILISATION AND IMPLANTATION
Page
9
Words matched
22 of 22

The answer appears as a continuous sentence in NCERT. This is that sentence.

How this line gives the answer

0, emb=1.0, combined=1.0). Verified: high — The span directly states 'The secretions of the acrosome help the sperm enter into the cytoplasm of the ovum through the zona pellucida', which matches option A exactly and distinguishes it from the incorrect options.

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Question text is reproduced from the published NEET 2011 paper for study and commentary. NCERT text is quoted, not redistributed; textbooks remain at ncert.nic.in. Our mapping method, including its measured error rates, is published at /methodology.