Assertion : The menstrual flow results due to breakdown of endometrial lining of the uterus and its blood vessels .
Reason : Rapid fall in the level of progesteron takes place due to degeneration of corpus luteum .

Assertion : If fertilization dies not occur than the corpus luteum begins to degenerate . Reason : The levels of progesterone and estrogen decline due to degeneration of the corpus luteum .

Assertion : If fertilization does not occur than the corpus luteum begins to degenerate . Reason : The levels of progesterone and estrogen decline due to degeneration of the corpus luteum .

Read the following statements regarding menstrual cycle in females : A. It is the reproductive cycle in all mammalian females. B. The menstrual flow results due to breakdown of myometrium lining of uterus. C. Graafian follicle and endometrium of uterus regenerates simultaneously during follicular phase of menstrual cycle. D. The corpus luteum secretes large amounts of oestrogen which is essential for maintenance of endometrium. select the correct statement from the above ?

Read the following statements regarding menstrual cycle in females : A. It is the reproductive cycle in all mammalian females. B. The menstrual flow results due to breakdown of myometrium lining of uterus. C. Graafian follicle and endometrium of uterus regenerates simultaneously during follicular phase of menstrual cycle. D. The corpus luteum secretes large amounts of oestrogen which is essential for maintenance of endometrium. select the correct statement from the above ?

Assertion : Warming a room by a heat blower is an example of forced convection. Reason : Natural convection takes place due to gravity.

Assertion : Warming a room by a heat blower is an example of forced convection. Reason : Natural convection takes place due to gravity.

Assertion : If a pendulum is suspended in a lift and lift is falling freely , then its time period becomes infinite . Reason : Free falling body has acceleration equal to acceleration due to gravity .

Assertion : Ovulation occurs on the 14^(th) day of menstrual cycle in a human female . Reason : The high level of estrogen is controlled 2 or 3 days before this event due to negative feed back.