Chorion in terrestrial vertebrate embryos:

1.	prevents desiccation of the embryo
2.	helps in the exchange of oxygen and carbon dioxide with the environment
3.	perform excretory functions
4.	acts as a shock absorber

In humans, the majority of the placenta is formed by:
1. allantois
2. amnion
3. chorion
4. yolk sac

The functions of the placenta include:

Human bones develop from embryonic:
1. ectoderm
2. endoderm
3. epiderm
4. mesoderm

Human lungs develop from embryonic:
1. ectoderm
2. endoderm
3. epiderm
4. mesoderm

During cleavage divisions, successive blastomeres:

1. have a decreasing nuclear/cytoplasmic ratio

2. become smaller and smaller

3. grow larger and larger

4. undergo meiotic divisions.

Human nervous system is derived from embryonic:

1. ectoderm

2. endoderm

3. epiderm

4. mesoderm

Gonadotropin releasing hormone (GnRH) is released from:

1. anterior pituitary

2. hypothalamus

3. gonads

4. posterior pituitary

Inhibin in males or females decrease the secretion of:

1. FSH

2. LH

3. GnRH

4. Sex steroids

Identify the correct statement regarding the onset of puberty amongst the following:

1. LH is the first hormone to demonstrate an increased secretion

2. GnRH secretion decreases

3. spermatogenesis in males in stopped

4. secretion of sex steroids decreases