Which part of the blastocyst develops into the embryo proper?

1. inner cell mass.

2. trophoblast.

3. blastocele.

4. yolk sac.

Milk secretion by mammary glands is under the control of:

The epidermis and the dermis of the skin develops respectively from embryonic:
1. ectoderm, endoderm
2. ectoderm, mesoderm
3. endoderm, mesoderm
4. endoderm, ectoderm

Identify the organ system in humans that is derived from all the three embryonic germ layers:
1. cardiovascular system.
2. digestive system.
3. endocrine system.
4. muscular system.

Lactation after child birth is possible due to decrease in the secretion of:
1. HCG
2. oxytocin
3. FSH and LH
4. estrogen and progesterone

The initial phase of the cortical reaction leads to:
1. slow block to polyspermy
2. fast block to polyspermy
3. formation of pronuclei
4. completion of acrosome reaction

Identify the incorrect statement:
1. Spermatogenesis begins at puberty.
2. Secondary spermatocyte has 23 chromosomes.
3. Oogenesis lasts only from puberty until menopause
4. oogenesis begins in fetal life

Identify the incorrect statement:

The testes of a pre-pubertal boy will have:
1. spermatocytes
2. spermatozoa
3. spermatogonia
4. spermatid

The dilated end of vas deferens are called:
1. corpus
2. seminal vesicle
3. ampulla
4. tubuli recti