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

Which of the following is $NOT$ a secondary sexual characteristic in females?

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.

$A$: After menopause,the levels of blood gonadotropins rise markedly.
$R$: At the time of menopause,all the ovarian follicles are converted into follicular atresia,and the ovaries do not respond to the gonadotropins.

Match the following columns and select the correct option.

Column $I$	Column $II$
$(a)$ Ovary	$(i)$ Human chorionic Gonadotropin
$(b)$ Placenta	$(ii)$ Estrogen and Progesterone
$(c)$ Corpus luteum	$(iii)$ Androgens
$(d)$ Leydig cells	$(iv)$ Progesterone only

The changes that occur in females at the onset of puberty are: