Question

Human male germ cell is
(a) Zygote
(b) Ovum
(c) Testis
(d) Sperm

Answer 1

Hint: Germ cells consist of chromosomes that undergo both mitosis and meiosis. The number of chromosomes in the germ cell is half of the exact number and it later gets fused from both the parents and forms a zygote.

Complete answer:
In humans, the male germ cell is sperm which helps to transmit genetic information from one generation to another generation.
In male spermatogenesis starts in the seminiferous tubule of testicles, in this, an immature germ cell spermatogonia is formed. After proliferation some cells which do not undergo proliferation get converted into primary spermatocytes by mitotic division. Further mitosis results in a secondary spermatocyte and this secondary spermatocyte after division form spermatid which is haploid. These spermatids after nuclear condensation form sperm, which is the mature male germ cell. The proliferation and differentiation of germ cells lead to development and programmed death of cells.
Mutation in genes causes tumor formation by spermatogonia and gonocytes. Diseases like klinefelter syndrome and androgen insensitivity cause infertility. The problem of tumour mainly occurs during pre puberty stage which restricts the production of mature germ cells. Another gene problem in male causes spermatogenic arrest which restricts the development of male germ cells before its maturation. This can be found in different stages of spermatogenesis. To preserve germ cells in case of any default cryopreservation techniques are used.

So, the correct answer is 'Sperm'.

Note: The naturally occurring toxicant in germ cells causes Apoptosis and this apoptosis can be controlled by taste receptors in male reproductive tissues. The taste receptor belongs to bitter taste including very high toxic alkaloids.