What is the highest concentration found in human seminal plasma?

The histological layers of the testis from outside to inside are:

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.

Seminiferous tubules open into

Which of the following glands is not present in pairs in the male reproductive system?

If the number of somatic chromosomes is $40$,what will be the number of chromosomes in the seminiferous tubule?