Question

What is the correct sequence of sperm formation?
A. Spermatogonia, Spermatozoa, Spermatocyte, Spermatid
B. Spermatogonia, Spermatocyte, Spermatids, Spermatozoa
C. Spermatid, Spermatocyte, Spermatogonia, Spermatozoa
D. Spermatogonia, Spermatocyte, Spermatozoa, Spermatid

Answer 1

Hint: Sperms are male gametes which are haploid in nature and develop from germ cells in the seminiferous tubules of the testis. It is a tubular structure and has a head, middle neck and end tail which helps in its motility.

Complete Answer:
Spermatogenesis is the process of formation of sperms (spermatozoa) in seminiferous tubules of testis. The various stages in the process of spermatogenesis are,

 1. Formation of spermatids - This process is also known as spermatogonia and in this process the sperm mother cells produce spermatids.

2. Spermiogenesis - In this stage, the spermatids transform into sperm.
It includes following stages:
(i) Multiplication Phase: Spermatogonial cells (2n) undergo repeated mitotic division.
(ii) Spermatocytogenesis: Spermatogonium divides mitotically to form primary spermatocytes.
(iii) Growth Phase: Primary spermatocytes grow to become almost double in size.
(iv) Maturation phase: Primary spermatocytes undergo first meiotic division to form secondary spermatocytes. Secondary spermatocytes undergo second meiotic division to form spermatids.
Spermatids become partially embedded in sertoli cells for spermatogenesis. The transformation of a non motile haploid Spermatid into motile spermatozoa in cytoplasm of Sertoli cells is called spermiogenesis

Thus, the correct order is - Spermatogonia, spermatocyte, Spermatids, spermatozoa.

Therefore, the correct option is B) Spermatogonia, Spermatocyte, Spermatids, Spermatozoa.

Note: The various factors which affect the process of spermatogenesis are,
The process is very sensitive hormonal levels and can affected by minute changes in it
- It is also sensitive to change in diet, exposure to drugs, etc.
- It is also very sensitive to temperature change.