Which of the following hormone levels will cause release of ovum (ovulation) from the grafflan follicle$?$
Low concentration of $FSH$
High concentration of Estrogen
High concentration of Progesterone
Low concentration of $LH$
The substance secreted by the corpus luteum is
Menstrual cycle occurs in
$A$ : Corpus luteum begins to atrophy after a short life of $10 \;to \;14$ days, if fertilisation does not occur.
$R$ : Luteolysis may be due to withdrawal of $LH$ support
Ovulation takes place in/on
In girl, the first menstruation begins at puberty and is called .....