Which part of the sperm help in its entry into the cytoplasm of the ovum?

This question was previously asked in
CUET Biology 23rd Aug 2022 Official Paper
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  1. Plasma membrane
  2. Nucleus
  3. Neck
  4. Acrosome

Answer (Detailed Solution Below)

Option 4 : Acrosome
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CUET General Awareness (Ancient Indian History - I)
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Detailed Solution

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Key Points
  • Sperms are the mammalian male reproductive cells that participate in fertilization and fuse with the ovum to produce a zygote. 
  • Each mature sperm consists of 3 parts:
  1. Head -
    • ​Mammalian sperm head is oval in shape and surrounded with an outer covering called the acrosome
    • The acrosome is composed of degradative enzymes like hyaluronidase and acrosin. 
    • These enzymes dissolve the outer layers of the ovum and facilitate in the entry of sperm into the cytoplasm of ovum
    • The head region also contains the nucleus. 
    • The nucleus carries the genetic material that undergoes fusion with the maternal DNA to form the DNA of the new individual. 
  2. Midpiece -
    • ​The middle region of the sperm comprises of compact helical mass of mitochondria.
    • The mitochondria provide energy for the movement of the tail.
    • This in turn facilitates sperm motility which is essential for fertilization.
  3. Tail
    • ​The sperm tail facilitates the movement of the sperm cell by moving in a whip-like manner.

F2 Vinanti Teaching 17.05.23 D1
Hence, the correct answer is option 4.

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