How many chromosome numbers are present in primary spermatocytes of human?

Spermatogenesis is under the regulatory influence of

In humans,at the end of the first meiotic division,the male germ cells differentiate into the

Which hormone stimulates the development of the corpus luteum?

From where does spermatogenesis start?

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