Question

The figure given below shows the structure of sperm. Identify the correct feature corresponding to the marked structure 1, 2, 3 and 4.

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.

Answer 1

Hint: The head, neck, middle portion, and tail make up a mammalian sperm cell. The head is made up of an acrosome surrounding the elongated haploid nucleus with tightly wound chromatin fibres. The acrosome has enzymes that can penetrate the female egg.

Complete Step by Step Answer:
The centrioles in the neck (proximal centriole and distal centriole). The axial filament of the sperm, which extends to the end of the tail, is produced by the distal centriole. The middle portion is used to produce ATP and comprises a central filamentous core with many spirally organised mitochondria. The spermatocyte is propelled by the beating actions of the tail or flagellum.
DNA is located in the sperm's head, and when it combines with DNA from an egg, a new person is born. The sperm can enter the egg through the acrosome, which is located at the tip of the sperm head. The midpiece contains the mitochondria which supplies the energy the tail needs to move.
To move the sperm in the direction of the egg, the tail whips back and forth. To fertilise a woman's egg, sperm must travel to her uterus and fallopian tube.
Hence, option B is the correct answer.

Note: Centrioles found in the sperm neck help to produce the cilium, or flagellum, of the sperm and, following fertilisation, the main hub for arranging microtubules in the zygote. The mitochondria, which serve as an energy source, are likewise located in the sperm neck or tail (depending on the species).