A) Tail
B) Head
C) Whole of it
D) Middle piece
Correct Answer: B
Solution :
The male gamete or sperm of most animals is highly specialized cell. The main function of a sperm during sexual reproduction are (i) to swim to the egg (ii) to fuse with the egg surface (iii) to cause the egg to start its development and (iv) to contribute a haploid set of chromosome having paternal genes to the diploid offspring. In addition, the sperm typically provides a pair of centroiles to the fertilized egg, which is used in the mitotic division (cleavage) that follows fertilization. Main structural sub-divisions of a typical sperm are the head, mid piece and tail. The head of sperm contains two main parts, the nucleus and the acrosome, both performing two basic functions of the sperm genetic and activating respectively. The nucleus occupies most of the available space of the sperm head and its shape ultimately determines the shape of the head of the sperm. The sperm nucleus does not contain any nuceolus, RNAs and fluid contents. Instead of usual histone proteins of the nucleosome, there are either very-arginine-rich histones or protamines (polypeptide with a very high content of arginine).
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