The phase of menstrual cycle in humans that last for 7-8 days is:

1. follicular phase

2. ovulatory phase

3. luteal phase

4. menstruation

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

Grey crescent is the area

(1) at the point of entry of sperm into ovum

(2) just opposite to the site of entry of sperm into ovum

(3) at the animal pole

(4) at the vegetal pole

Which of the following statements is correct?

(1) Monkey, apes and humans exhibit estrous cycle.

(2) Urine is pale yellow and slightly alkaline.

(3) Lots of enzymes are present in bile juice.

(4) Ovulation in humans is spontaneous.

The 'cells of Rauber' are

(1) secretory cells of endometrium in uterus

(2) inner cell mass of blastocoel

(3) outer cells of trophoblast in contact with uterine wall

(4) cells of trophoblast, in contact with inner cell mass of blastocyst.