Assertion : Corpus luteum degenerates in the absence of fertilization.
Reason: Progesterone level decrease.

When does the corpus luteum degenerate ?

Corpus luteum gets converted into corpus albicans in absence of fertilization.

A decrease in the level of estrogen and progesterone causes

A decrease in the level of estrogen and progesterone causes

In case of non-fertilization, corpus luteum

In case of non-fertilization, corpus luteum

Assertion : Corpus luteum is present in proliferative phase of menstrual cycle . Reason : High concentration of progesterone is present in proliferative phase .