For normal fertility,what percentage of sperm in a human male ejaculate must have vigorous motility (in $\%$)?

If the number of chromosomes in a somatic cell is $42$,what will be the number of chromosomes in the cuboidal epithelial cells of the seminiferous tubules?

The process of maturation of reproductive cells of testes in males to form the male gamete or sperm is known as

Which of the following hormone levels will cause the release of an ovum (ovulation) from the Graafian follicle?

What begins to be produced in females at puberty?

Which part of the ovary in mammals acts as an endocrine gland after ovulation?