The figure shows a section of human ovary. Select the option which gives the correct identification of either $A$ or $B$ with function/ characteristic.
$B$ - Corpus luteum - Secretes progesterone
$A$ - Tertiary follicle - Forms Graafian follicle
$B$ - Corpus luteum - Secretes estrogen
$A$ - Primary oocyte - It is in the prophase $I$ of the meiotic division
In humans, at the end of the first meiotic division, the male germ cells differentiate into the
Graafian follicle are characteristically found in the
$A$ - Acrosome possesses mitochondria.
$R$ -Middle piece of sperm is filled with enzymes
Insemination is
Secondary oocyte is ..........