The cleavage having incomplete division of egg is known as

After the first meiotic division,the primary spermatocyte differentiates into .........

Secretion of progesterone by the corpus luteum is initiated by

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

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

Which pituitary hormone regulates the Sertoli cells?