Which of the following is $NOT$ a part of the intratesticular genital duct system?

The location and secretion of Leydig cells are:

The seminal plasma in humans is rich in which of the following?

Given below are two statements:
Statement-$I$: The scrotum helps in maintaining the low temperature of the testes.
Statement-$II$: Low temperature,compared to the normal internal body temperature,is necessary for spermatogenesis.
In the light of the above statements,choose the most appropriate answer from the options given below.

What are the location and secretion of the $Leydig$ cells,respectively?

Testicular hormones like androgens are synthesized by . . . . . . .