Q169 / 200 · NEET 2010 (Screening) · Zoology

Which one of the following statements about human sperm is correct?

  • A
    Acrosome has a conical pointed structure used for piercing and penetrating the egg, resulting in fertilization
  • Correct answer
    B
    The sperm lysins in the acrosome dissolve the egg envelope facilitating fertilization
  • C
    Acrosome serves as a sensory structure leading the sperm towards the ovum
  • D
    Acrosome serves no particular function

Solution

Penetration of human sperm is a chemical mechanism. In this, acrosome of sperm undergoes acrosomal reaction and releases certain sperm lysins, which dissolve the egg envelope locally and make the path for the penetration of sperm. Sperm lysins are acidic proteins. These sperm lysins contain a lytic enzyme hyaluronidase that dissolves the hyaluronic acid polymers in the intercellular spaces, which holds the granulosa cells of corona radiata together corona penetrating enzyme and acrosin.

Hence, the correct answer is option: 'B'.

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