A group of medical students carried out a detailed study on the impact of various factors on the different hormones during the menstrual cycle in a human female. They collected the data with different factors. Given below is the graph plotted from the data collected showing the morning temperature and concentration of hormones FSH, LH, oestrogen, and progesterone during normal menstrual cycle in a woman.
 

The time of ovulation is of importance in case of:
i. Couples having difficult in conception
ii. To know the safe period for prevention of pregnancy
iii. To inhibit the process of ovulation
iv. To stimulate ovarian follicular development