What ensures that only one sperm can fertilize the ovum?

1. Corona radiata

2. Ground substance around ovum

3. Zona pellucida

4. Acrosome

During pregnancy the levels of thyroxin:

1. Increase several folds in maternal blood

2. Increases several folds in fetal blood

3. Decreases several folds in maternal blood

4. Decreases several folds in fetal blood

The first movements of the fetus and the appearance of hair on the head are usually observed during:

1. 2^nd month

2. 3^rd month

3. 5^th month

4. 6^th month

The milk produced during the initial few days of lactation, called colostrum, is essential for the new born as colostrums contains:

1. Large amount of glucose

2. Anti-infective antibodies

3. Fats

4. Various hormones

All of the following structures are derived from mesoderm except the ____.

1. pancreas

2. dermis of skin

3. notochord

4. heart

Sperm has several components out of which the function of the acrosome is to:

Which is a true statement about luteinizing hormone in the female reproductive system?
1. It inhibits ovulation.
2. It causes mitosis of the primary oocyte. 
3. It is produced by the hypothalamus 
4. It is responsible for mediating the production of estrogen and progesterone simultaneously.

Which of the following is secreted only during the luteal phase of a menstrual cycle ?

1. LH

2. FSH

3. Estrogen

4. Progesterone

In the process of oogenesis, a polar body:

I. is formed before fertilization.

II. is formed after fertilization.

III. normally receives most of the cytoplasm of the cell.

1. Only I is correct

2. Only II is correct

3. Only I and II are correct

4. I, II, and III are correct

Which event is incorrectly matched with the time of its occurence [with respect to a 28 days menstrual cycle]?

1. Beginning of the menstrual flow - Day 1

2. Ovulation - Day 14

3. Beginning of the proliferative phase - Day 5

4. Peak  secretion of estrogen - Day 22