The sperm head is covered by a cap-like structure, acrosome. The acrosome is filled with:
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → Enzymes
A human sperm has a head, a neck, a middle piece and a tail, all enclosed by a plasma membrane. The head holds the haploid nucleus. The front part of the head is covered by a cap-like structure, the acrosome. Its enzymes help the sperm to enter the ovum.
(1) Fructose — Incorrect. Fructose is a sugar present in the secretion of the seminal vesicles, which forms part of the semen. It is not stored in the acrosome.
(2) Mitochondria — Incorrect. The mitochondria are in the middle piece. They give the energy for the movement of the tail.
(3) Enzymes — Correct. The acrosome is filled with enzymes that help in fertilisation of the ovum.
(4) Testicular Hormones — Incorrect. The testicular hormones, the androgens, are made by the Leydig cells outside the seminiferous tubules. They are not carried in the sperm.
NCERT Extract:
Gametogenesis – …
Figure 2.6 Structure of a sperm