Question

Sperm entry into the ovum is assisted by
(a) Fertilizin
(b) Antifertilizin
(c) Hyalunic acid
(d) Hyaluronidase

Answer 1

Sperm entry into the ovum is assisted by (a) Fertilizin

Answer 2

Answer:

Sperm entry into the ovum is assisted by Option A - fertilizin.

Explanation:

• A mature female egg produces a glycoprotein known as fertilizin, which facilitates entry of sperm into the egg.
• Antifertilizin is a protein which is found in the plasm membrane of the sperm.
• Antifertilizin, prevents the entry of sperm into the egg, so, fertilizin from the egg binds with this antifertilizin molecule and a reaction takes place.
• Because of this reaction between fertilizin and antifertilizin, sperm’s entry becomes easier into the egg.
• Female egg has hyaluronic acid surrounding it, which acts as a natural sperm selector and prevents entry of sperm.
• Hyaluronidase enzyme dissolves this hyaluronic acid which is present on the egg’s surface and thereby facilitates sperm’s entry into the egg.

Hence, major role is of fertilizin in facilitating sperm’s entry into the egg. Therefore, option A is the correct answer.

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