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 haploid nucleus.
C) 3 - Neck: It possesses few ribosomes which produces energy for the process of fertilisation.
D) 4 - Tail: It releases energy source for swimming of sperm.
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. Neck contains centrioles (proximal centriole and distal centriole). 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 spermatocyte.
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