Which of the following cells secrete testicular hormones called androgens and form endocrine part of the testis?
Leydig cells
Interstitial cells
Sertoli cells
Both $(a) \;\&\; (b)$
In $28$ day human menstrual cycle, ovulation occurs on
In the first phase of gastrulation of amphibians there occurs the separation of
The primordial germ cells make their appearance from wall of
Which of the following is a set of male accessory ducts?
How many sperms are formed by four primary spermatocytes?