Secretions from which one of the following are rich in fructose,calcium and some enzymes?

Cells of Leydig are found in

Which cells secrete testosterone?

In the mammalian reproductive system,testicular degeneration and other diseases occur due to the deficiency of .......

If the $vas$ $deferens$ of a man is surgically disconnected,what will be the result?

Given below is a diagram of the $T.S.$ of a testis. Select the option which gives the correct identification of the function of cells labeled $A, B, C,$ and $D$ from the options given below.
$A$ - cells undergo spermatogenesis to produce spermatozoa.
$B$ - cell responsible for the development of male secondary sexual characters.
$C$ - heads of sperms remain attached to these cells.
$D$ - haploid male gamete.