The hormone which brings about characteristic changes in the male at puberty is called:

Write two major functions each of testis and ovary.

$A$ boy after attaining sexual maturity shows muscular growth,growth of facial and axillary hair,aggressive behavior,and a low pitch of voice. These changes are attributed to the . . . . . . hormone.

In males,the essential hormone for secondary sexual characteristics is

Testosterone is produced (synthesized) by:

The target of $ICSH$ is