Changes during Menstrual Cycle

Q. Follicular atresia is

1. Degeneration of zygote
2. Degeneration of ovarian follicles
3. Degeneration of embryo
4. Formation of corpus luteum

Q.

How many chromosomes are present in the first polar body?

Q. Oogenesis is a complex process regulated by various hormones. Which hormone acts on primary follicles and stimulate its conversion into mature Graafian follicles?

Q.

The corpus luteum secretes a hormone called

1. Testosterone

2. Prolactin

3. Progesterone

4. Aldosterone

Q. Progesterone is a hormone that is essential for the maintenance of pregnancy in a female. How can it act as a contraceptive?

1. High levels of progesterone can cause endometriosis.
2. High levels of progesterone cause early contraction of the uterus leading to the expulsion of zygote.
3. High levels of progesterone cause the endometrial lining to rupture and bleed out before implantation can occur.
4. High progesterone levels reduce the secretion of gonadotropins, thus preventing ovulation.

Q. The given diagram represents the uterus, identify the parts labelled as A, B, C and mark the correct option.

1. A-myometrium, B-perimetrium, C-endometrium
2. A-endometrium, B-myometrium, C-perimetrium
3. A-endometrium, B-perimetrium, C-myometrium
4. A-perimetrium, B-myometrium, C-endometrium

Q. Given below is the unorganized list of some
important events in the human female
reproductive cycle. Identify the correct
sequence of these events and select the
correct option.
(i) Secretion of FSH
(ii) Growth of corpus luteum
(iii) Growth of the follicle and oogenesis
(iv) Ovulation
(v) Sudden increase in the levels of LH

1. $\left(i\right)\to \left(iv\right)\to \left(iii\right)\to \left(v\right)\to \left(ii\right)$
2. $\left(ii\right)\to \left(i\right)\to \left(iii\right)\to \left(iv\right)\to \left(v\right)$
3. $\left(iii\right)\to \left(i\right)\to \left(iv\right)\to \left(ii\right)\to \left(v\right)$
4. $\left(i\right)\to \left(iii\right)\to \left(v\right)\to \left(iv\right)\to \left(ii\right)$

Q. Signals for parturition originate from ___________.

1. fully developed foetus only
2. GnRH released from maternal hypothalamus
3. placenta only
4. both placenta as well as fully developed foetus

Q. Which of the following is the most likely reason for the absence of a menstrual period after a regular menstrual cycle?

1. Maintenance of the hypertrophic endometrial lining
2. Fertilization of ovum
3. Maintenance of high concentration of sex hormones in the blood stream
4. Retention of well-developed corpus luteum

Q.

Do polar bodies have chromosomes?

Q. Read the following statements about
menstrual cycle and select the correct
statements.
(i) Lack of menstruation may be indicative of pregnancy.
(ii) The changes in the ovary and the uterus
are induced by changes in the levels of
ovarian hormones only.
(iii) LH surge induces ovulation.
(iv) If fertilization occurs, corpus luteum
degenerates immediately.

1. (i) and (ii)
2. (ii) and (iii)
3. (i) and (iii)
4. (ii) and (iv)

Q. In the absence of pregnancy, corpus luteum_______.

1. starts to degenerate
2. becomes active and secretes FSH and LH
3. produces lots of oxytocin and relaxin
4. is maintained by progesterone

Q.

With respect to the assertion and reason given, choose the correct answer.

Assertion [A]: During secretory phase, low levels of progesterone inhibit the production of FSH.
Reason [R]: As long as progesterone levels are low, the endometrium is maintained and no new follicles are stimulated.

1. [A] is true and [R] is false

2. Both [A] and [R] are false

3. Both [A] and [R] are true, and [R] is a correct explanation to [A]

4. [A] and [R] are true, but [R] is not a correct explanation to [A]