Fertilisation of an egg cell means......
$(1)$ End of the process of oogenesis
$(2)$ Induces the completion of the second meiotic division
$(3)$ The corpus luteum degenerates
$(4)$ Signals for maintaining progesterone levels in the blood
$(5)$ Formation of a zygote

$A$: $LH$ acts on Sertoli cells for release of certain factors required for spermatogenesis.
$R$: Spermiation occurs directly under the influence of $LH$.

Choose the correct pair -

Given below are two statements.
Statement $I$: Mule is an intergeneric sterile hybrid.
Statement $II$: Mule is sterile due to failure of proper gametogenesis.
In the light of the above statements,choose the most appropriate answer from the options given below.

Which of the following statements are true about the female reproductive system?
$(A)$ Both estrogen and progesterone are necessary for development of follicle
$(B)$ Progesterone production is under the control of $LH$
$(C)$ The part of the oviduct is isthmus; has a narrow lumen and it joins the uterus
$(D)$ During pregnancy all events of the menstrual cycle stop and there is no menstruation
$(E)$ The graafian follicle ruptures to release the primary oocyte from the ovary by the process called ovulation

Adolescence is a bridge linking .......... and .......... .
$(i)$ Adolescence $(ii)$ Childhood $(iii)$ Old age $(iv)$ Adulthood