The correct sequence of spermatogenetic stages leading to the formation of sperms in a

mature human testis is

1. spermatocyte - spermatogonia - spermatid - sperms

2. spermatogonia - spermatocyte - spermatid -sperms

3. spermatid-spermatocyte-spermatogonia -sperms

4. spermatogonia-spermatid-spermatocyte -sperms

Which one of the following is the correct matching of the events occurring during

menstrual cycle?

1. Ovulation                         - LH and FSH attain peak level and shrp fall in the secretion 

                                              of progesterone

2. Proliferative phase                  - Rapid regeneration of myometrium and  maturation of

                                                  Graafian follicle

3. Development of corpus luteum - Secretory phase and increased secretion of

                                                    progesterone

4. Menstruation                          - Breakdown of myometrium and ovum not fertilized

In humans, at the end of the first meiotic division, the male germ cells differentiate into

the 

1. primary spermatocytes

2. secondary spermatocytes

3. spermatids

4. spermatogonia

Which extra embryonic membrane in humans prevents desiccation of the embryo inside

the uterus ?

1. Chorion

2. Allantois

3. Yolk sac

4. Amnion

Which one of the following statement is incorrect about menstruation?

1. During normal menstruation about 40 mL blood is lost

2. The menstrual fluid can easily clot

3. At menopause in the female, there is especially abrupt increase in gonadotropic

hormones

4. The beginning of the cycle of menstruation is called menarche

Which part of ovary in mammals acts as an endocrine gland after ovulation?

1. Graafian follicle

2. Stroma

3. Germinal epithelium

4. Vitelline membrane

In the human female, menstruation can be deferred by the administration of:

1. LH only

2. Combination of FSH and LH

3. Combination of estrogen and progesterone

4. FSH only

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

1. Estrogen

2. FSH

3. FSH-RH

4. Progesterone

Cleavage differs from mitosis in lacking

1. synthetic phase

2. growth phase

3. both 1. and 2.

4. all of these

Low levels of LH during the secretory phase of the menstrual cycle are primarily due to

1. high estrogen level

2. inhibin

3. high progesterone level

4. high estrogen and progesterone level.