Question

What occurs before ovulation?
A. A rise in the levels of progesterone only
B. A rise in the levels of estrogen only
C. A rise in the levels of estrogen and progesterone
D. A fall in estrogen levels only

Answer 1

Hint: Ovulation is the release of ova or ovum from the uterus in a female reproductive system which signifies that fertilization did not take place. During ovulation hormonal levels are up and down in the body. Ovulation is the release of ovum and if fertilization did not occur it sheds off in form menstruation. Menstruation occurs every month in a female body. Ovulation takes place at the fourteen days of the menstrual cycle.

Complete answer:
Option A: A rise in the levels of progesterone only- during the ovulation the pituitary gland secretes two kinds of hormones one is LH and FSH. The levels of progesterone will be gradually increasing not a rise but gradually.
Option A is not correct
Option B: A rise in the levels of estrogen only- ovulation occurs when the luteinizing hormone secretes estrogen which helps the ovum to release. The estrogen levels are low at that period of time.
Option B is not correct.
Option C: A rise in the levels of estrogen and progesterone- the follicle hormone helps in release of follicles to shed off, the levels of hormones are very different as estrogen is seem to be low and progesterone will gradually rise.
Option C is not correct.
Option D: A fall in estrogen levels only- estrogen levels have seen to be decreased and progesterone rises. This is the only hormonal surge which is true.
Option D is correct.

Hence, Option D is the correct answer.

Note:
Based on the ovulation surge, eggs or ovum are also covered by a plasma membrane or a cell membrane. In most animals’ special protective membranes are deposited outside the plasma membrane. These membranes are described as egg membranes. Based on the egg membrane origin it is divided into following types- primary egg membrane and secondary egg membrane.