Extra embryonic membranes of mammalian embryo are derived from:

1. Inner cell mass

2. Formative cells

3. Trophoblast cells

4. Follicle cells

What causes the onset the puberty in males?

1. Increase in secretion of testosterone by testis

2. Decrease in secretion of testosterone by testis

3. Increase in secretion of GnRH by hypothalamus

4. Decrease in secretion of GnRH by hypothalamus

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

In humans, the sex of the baby is determined:
1. At the time of fertilization and by the father
2. At the time of fertilization and by the mother
3. At the time of implantation and by the father
4. At the time of implantation and by the mother

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 signals of fetal ejection reflex originate from:

1. Maternal pituitary

2. Maternal hypothalamus

3. Fully developed fetus and placenta

4. Fetal pituitary

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