The correct option is D Growth
In
testis, the immature male germ cells, spermatogonia produce sperms by a process
called spermatogenesis that begins at puberty. It occurs in four stages. During
the first step of spermatogenesis, i.e. spermatocytogenesis, the spermatogonia
present on the inside wall of the seminiferous tubules multiply by mitotic
division and increase in numbers. Each spermatogonia is diploid containing 46
chromosomes. When spermatogonia accumulates large amount of nutrient and
chromatin material and increases in size, it is known as primary spermatocytes.
It periodically undergo meiosis and others remain as spermatogonia cells. Formation
of primary spermatocyte/oocyte from a spermatogonium/oogonium requires growth.