Corpus luteum is developed from

Which of the following processes is initiated by $FSH$?

Given below are two statements :
Statement-$I$ : Each primary oocyte gets surrounded by a layer of granulosa cells and is called a primary follicle.
Statement-$II$ : At puberty,only $60,000-80,000$ primary follicles are left in each ovary.
In the light of the above statements,choose the most appropriate answer from the options given below :

The growing ovarian follicles mainly secrete a hormone named?

$A$ - Acrosome possesses mitochondria.
$R$ - Middle piece of sperm is filled with enzymes.

After ovulation,the Graafian follicle transforms into .........