In most mammals, the testes are located in the scrotal sac for

The cells of $Leydig$ produce and secrete .......... .

Assertion $(A) :-$ Sperm production occurs in the seminiferous tubules.
Reason $(R) :-$ The seminiferous tubules are lined on their inside by spermatogonia and Sertoli cells.

Vasa deferentia together with the duct from the seminal vesicle forms:

Which is the primary sex organ in males?

Which of the following is a mass of muscle tissue in the penis of humans?