The sperm produces substances of enzymatic nature called sperm lysin. In mammals,it is called

Graafian follicles are formed by the active division of

Which of the following statements are true for spermatogenesis but do not hold true for Oogenesis?
$(a)$ It results in the formation of haploid gametes
$(b)$ Differentiation of gamete occurs after the completion of meiosis
$(c)$ Meiosis occurs continuously in a mitotically dividing stem cell population
$(d)$ It is controlled by the Luteinising hormone $(LH)$ and Follicle-Stimulating Hormone $(FSH)$ secreted by the anterior pituitary
$(e)$ It is initiated at puberty
Choose the most appropriate answer from the options given below:

The middle piece of a mammalian sperm contains:

Arrange in the correct sequence the structures formed during spermatogenesis:
$(a)$ Spermatogonia
$(b)$ Secondary spermatocyte
$(c)$ Primary spermatocyte
$(d)$ Spermatid

When a germ mother cell enters meiosis,it is called .......