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Question: Which of the following characteristics differentiates a sperm from egg? A. Cytoplasm is more abund...

Which of the following characteristics differentiates a sperm from egg?
A. Cytoplasm is more abundant in sperm than in egg
B. Accessory membranes are absent in sperm but present in egg
C. Nucleus is clear in sperm and very compact in egg
D. Mitochondria form a sheath in egg and diffused in sperm.

Explanation

Solution

The sperm and ovum are released during the reproduction process. The sperms are released by the male whereas the egg is released by the female. Sperms are produced in the testis and the ovum or egg is produced in the ovary. The ovum is static whereas the sperm is motile. The union of the egg and the sperm produces a zygote.

Complete answer:
The sperm is surrounded by a plasma membrane whereas the egg is surrounded by an egg envelope along with a plasma membrane, which is considered as an accessory membrane.
The cytoplasm is generally more abundant in the egg when compared to the sperm. The sperm has a differentiated body structure. It is divided into a head, neck, middle piece, and a tail.
The nucleus is clear and condensed without a nucleoplasm in sperm. It contains either X or Y chromosomes. Whereas the nucleus is very compact in eggs and contains nucleoplasm called the germinal vesicles. It contains only X chromosomes.
The mitochondria present in sperm are spherical and are compactly arranged in the middle piece of sperm. Whereas the mitochondria is sheath diffused or scattered in the cytoplasm of the egg.
So, the correct answer is “Option B Accessory membranes are absent in sperm but present in egg.”.

Note:
The sperms are formed and released by the process of spermatogenesis. The ovum or egg is released by the process of oogenesis. The sperm is surrounded by only a plasma membrane. The ovum contains several protective layers such as zona pellucida, perivitelline space and the cells of corona radiata.