Human Reproduction Question 361
Question: The figure given below shows the structure of sperm. Identify the correct feature corresponding to the marked structure 1, 2, 3 and 4.
Options:
A) 1 - Head: Its anterior portion is covered by a structure filled with enzymes that help in the fusion of male and female gametes.
B) 2 - Middle piece: It contains a diploid nucleus.
C) 3 - Neck: It possesses few ribosomes which produce energy for the process of fertilisation.
D) 4 - Tail: It provides energy for the swimming of sperm.
Show Answer
Answer:
Correct Answer: B
Solution:
[a] The mammalian sperm cell consists of a head, neck, middle piece and a tail.
The head contains the elongated haploid nucleus with densely coiled chromatin fibres, surrounded anteriorly by an acrosome.
Acrosome contains enzymes for penetrating the female egg.
Centrioles are located in the centrosome, not in the neck.
Distal centriole gives rise to axial filament of the sperm which runs up to the end of the tail.
The middle piece has a central filamentous core with many spirally arranged mitochondria which is used for ATP production.
The tail or flagellum performs the beating movements that propel the spermatozoa.
BETA
