Identify $X$ from the figure.

At menopause,there is a rise in the urinary excretion of:

Name the functions of the following:
$(a)$ Corpus luteum
$(b)$ Endometrium
$(c)$ Acrosome
$(d)$ Sperm tail
$(e)$ Fimbriae

Identify the odd one out from the following.

Which of the following statements are correct regarding the female reproductive cycle?
$A$. In non-primate mammals,cyclical changes during reproduction are called the oestrus cycle.
$B$. The first menstrual cycle begins at puberty and is called menopause.
$C$. Lack of menstruation may be indicative of pregnancy.
$D$. Cyclic menstruation extends between menarche and menopause.
Choose the most appropriate answer from the options given below.

The eggs in which the fate of every part of the egg becomes fixed are called: