Which of the following is very close to the time of
ovulation?
1. Peak of progesterone.
2. Minimum level of estrogen.
3. Peak of LH and FSH.
4. Thickest layer of endometrium.

The main function of mammalian corpus luteum is to produce

1. estrogen only

2. progesterone

3. human chorionic gonadotropin

4. relaxin only

Withdrawal of which of the following hormones is the immediate cause of menstruation ?

1. Estrogen

2. FSH

3. FSH-RH

4. Progesterone

The main cause of the disintegration of the endometrial lining

1. LH surge

2. Degeneration of corpus luteum

3. Ovulation during mid-cycle

4. Implantation leads to pregnancy

During pregnancy:

1. All events of menstrual cycle stop and there is no menstruation

2. Events of menstrual cycle continue but there is no menstruation

3. Events of menstrual cycle contInue but there is menstruation only in the first trimester

4. All events of menstrual cycle stop and there is menstruation only in the first trimester

Which one of the following statements is incorrect about menstrual cycle ?

1. The first menstruation begins at puberty and is called menarche

2. Lack of menstruation may also occur due to some environmental factors like stress, poor health

3. Corpus luteum secretes large amounts of progesterone which is essential for maintenance of endometrium

4. In absence of fertilisation, corpus luteum degenerates in luteal phase and new follicles start developing immediately

Identify the incorrectly matched pair:

In the absence of fertilization, corpus luteum:

Which of the following hormones show peak solely in post ovulatory phase?

Menstruation is triggered by an abrupt decline in the amount of:

1. Estrogen

2. Progesterone

3. LH

4. FSH