Assertion : Corpus luteum is produced by Graafian follicle after ovulation. Reason : It secretes estrogen which is necessary to maintain pregnancy.

Step-by-step solution

After ovulation, the empty Graafian follicle contains a blood clot which is called corpus haemorrhagic. Its granulosa cells continue to proliferate, develop yellow carotene pigment or lutein and get converted into lutein cells. This converts the ruptured follicle into yellow body called corpus luteum. It becomes a temporary endocrine gland secreting progesterone with small quantity of estrogen. in absence of fertilization, after few days, corpus luteum ultimately stops activity, loses yellow colour, begins to degen