After spermiogenesis,sperm head is embedded in . . . . . . .

In mammals, the estrogens are secreted by the Graafian follicle from its:

For ovulation,what is required for the reflex action of the ovum?

How many spermatogonia in the testis of a grasshopper must undergo division to produce $52$ spermatozoa?

Which one of the following cells,found in the testes of a rabbit,secretes male hormones?

In humans,what is the ratio of the number of gametes produced from one male primary sex cell to the number of gametes produced from one female primary sex cell?