Question

Which of the following parts of the sperm is covered by manchette?
A. Posterior half of the nucleus.
B. Neck
C. Middle piece of sperm
D. All the above

Answer 1

Sperm is a male cell or gamete.
It is usually motile in nature.
Animals produce motile sperms with flagellum known as spermatozoa.
Whereas some algae and fungi produce non motile sperm cells known as spermatia.

Complete answer: The mammalian sperm cell is further divided into 2 main parts:
1. Head: This part of the sperm consists of a nucleus which is covered with densely coiled chromatin fibers and it is surrounded anteriorly by a thin, flattened sac known as acrosome, which contains enzymes that are useful for penetrating the female egg.
It also contains vacuoles.
2. Tail: It is also called the flagellum and is the longest part and is capable of performing wave-like motion that propels sperm for swimming and aids in the penetration of the egg.
The neck part or connecting piece consists of one typical centriole and one atypical centriole such as the proximal centriole-like.
Manchette: it is a kind of temporary collar sheath present around the head of the sperm and that serves for guiding the shape of the developing head.
It usually covers the head part, neck part, middle piece, and tail.
It also acts as a conduit for protein transport from the head to the base of the tail.

So, the correct option is option D) All of the above.

Note: During the process of fertilization, the sperm provides three essential parts to the oocyte:
(1) act as signaling or activating factor, which further causes the metabolically dormant oocyte to activate
(2) the haploid paternal genome;
(3) as the centriole that is responsible for forming the centrosome and microtubule system.