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.

An oocyte is released from the ovary under the influence of LH

1. After completing meiosis and before polar body are released

2. After completing meiosis I and before release of polar body

3. After completing meiosis

4. After completing meiosis I and after release of polar body

Both corpus luteum and macula lutea are

1. found in human ovaries

2. a source of hormones

3. characterized by a yellow colour

4. contributory in maintaining pregnancy.

Which one of the following statements with regard to embryonic development in humans

is correct?

1. Cleavage divisions bring about considerable increase in the mass of protoplasm.

2. In the second cleavage division, one of the two blastomeres usually divides a little

sooner than the second.

3. With more cleavage divisions, the resultant blastomeres become larger and larger.

4. Cleavage division results in a hollow ball of cells called morula

Women who consumed the drug thalidomide for relief from vomiting during early months

of pregnancy gave birth to children with 

1. No spleen

2. Harelip

3. Extra fingers and toes

4. Underdeveloped limbs

Which one of the following events is correctly matched with the time period in a normal menstrual cycle?

(1) Release of egg : 5^th day

(2) Endometrium regenerates : 5 - 10 days

(3) Endometrium secretes nutrients for implantation : 11-18 days

(4) Rise in progesterone level : 1 - 15 days

Which of the following is true regarding sperm?

(1) Fertilizin : For penetrating egg membrane

(2) Hyaluronidase : For penetrating egg membrane

(3) Acrosin : Dissolves corona radiata

(4) Capacitation : Takes place in penis

Acrosome reaction in sperm is triggered by

(1) capacitation

(2) release of lysin

(3) influx of Ca++

(4) release of fertilizin

How many sperms are formed from a secondary spermatocyte?

(1) 4

(2) 8

(3) 2

(4) 1