Which of the following statements are correct about the structure of a sperm?
A. It is composed of head, thorax, neck and tail
B. The neck region contains a lot of mitochondria
C. The mitochondria produces energy for the movement of tail
D. The tail facilitate sperm motility essential for fertilisation
Choose the most appropriate answer from the options given below:
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → C and D only
A. It is composed of head, thorax, neck and tail — False. A sperm has a head, neck, middle piece and tail; there is no thorax.
B. The neck region contains a lot of mitochondria — False. The mitochondria are in the middle piece.
C. The mitochondria produces energy for the movement of tail — True.
D. The tail facilitate sperm motility essential for fertilisation — True.
NCERT Extract:
Gametogenesis – “… Let us examine the structure of a sperm. It is a microscopic structure composed of a head, neck, a middle piece and a tail (Figure 2.6). A plasma membrane envelops the whole body of sperm. The sperm head contains an elongated haploid nucleus, the anterior portion of which is covered by a cap-like structure, acrosome. The acrosome is filled with enzymes that help fertilisation of the ovum. The middle piece possesses numerous mitochondria, which produce energy for the movement of tail that facilitate sperm motility essential for fertilisation.”
