For normal fertility what percent of the sperm in ejaculation must exhibit vigorous motility?

1. 20

2. 30

3. 40

4. 60

The division of primary oocyte results in:

1. unequal cells a smaller haploid secondary oocyte and a larger diploid polar body

2. unequal cells a larger haploid secondary oocyte and a smaller haploid polar body

3. unequal cells a smaller diploid secondary oocyte and a larger haploid polar body

4. equal cells - a haploid secondary oocyte and a haploid polar body

The correct sequence of the various phases of a typical menstrual cycle is:

1. Menstrual $\stackrel{}{\to }$ $$ $$ $$ $$ $$ $$ $$ $$ $$ $$ Follicular $\stackrel{}{\to }$ $$ $$ $$ $$ $$ $$ $$ $$ $$ $$ secretory $\stackrel{}{\to }$ $$ $$ $$ $$ $$ $$ $$ $$ $$ $$ Ovulatory

2. Menstrual $\stackrel{}{\to }$ $$ $$ $$ $$ $$ $$ $$ $$ $$ $$ Follicular $\stackrel{}{\to }$ $$ $$ $$ $$ $$ $$ $$ $$ $$ $$ Ovulatory $\stackrel{}{\to }$ $$ $$ $$ $$ $$ $$ $$ $$ $$ $$ secretory

3. Ovulatory $\stackrel{}{\to }$ $$ $$ $$ $$ $$ $$ $$ $$ $$ $$ Follicular $\stackrel{}{\to }$ $$ $$ $$ $$ $$ $$ $$ $$ $$ $$ secretory $\stackrel{}{\to }$ $$ $$ $$ $$ $$ $$ $$ $$ $$ $$ Menstrual

4. Menstrual $\stackrel{}{\to }$ $$ $$ $$ $$ $$ $$ $$ $$ $$ $$ secretory $\stackrel{}{\to }$ $$ $$ $$ $$ $$ $$ $$ $$ $$ $$ Follicular $\stackrel{}{\to }$ $$ $$ $$ $$ $$ $$ $$ $$ $$ $$ Ovulatory

During pregnancy:

1. All events of menstrual cycle stop and there is no menstruation

2. Events of menstrual cycle continue but there is no menstruation

3. Events of menstrual cycle contInue but there is menstruation only in the first trimester

4. All events of menstrual cycle stop and there is menstruation only in the first trimester

In the absence of fertilization, corpus luteum:

1. Stops secreting progesterone but increases the secretion of estrogen

2. Stops secreting estrogen but increases the secretion of progesterone

3. Increases the secretion of both progesterone and estrogen

4. Degenerates

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