Identify the correct option ($A$), ($B$), ($C$), ($D$) with respect to spermatogenesis.

The figure given below depicts a diagrammatic sectional view of ovary. Which one set of three parts out of $I-VI$ are correctly identified?

Why the testes in human beings and mammals are situated outside the abdominal cavity within a pouch called scrotum?

The sperm produces substances of enzymatic nature called sperm lysin. In mammals, it is called

After ovulation the graafian follicle becomes an endocrine organ called