(a) Draw a diagram of the structure of a human ovum surrounded by corona radiata.Label the following parts:
(i) Ovum
(ii) Plasma membrane
(iii) Zona pellucida.
(b) State the function of Zona pellucida .

3

(a)

Name the source of gonadotropins in human females.Explain the changes brought about in the ovary by these hormones during menstrual cycle.

3

(a)

Name the pituitary hormones influencing Leydig cells and Sertoli cells present in human testes.Explain the functions of these cells.

3

(a)

What are the major fuctions of male accessory ducts and glands?

3

(a)

How many eggs are released by a human ovary in a month? How many eggs do you think would have been released if the mother gave birth to identical twins?Would your answer change,if the twins born were fraternal?

3

(a)

Describe the duct system of human male reproductive system.

3

(a)

Describe the different parts of the fallopian tube of human female reproductive system.

3

(a)

(a) Mention the event of meiosis that occurs in the tertiary follicle in a human ovary.
(b) Name the phase of menstrual cycle,when a Graafian follicle transforms into an endocrine structure.Write its action thereafter.

3

(a)

(a) In which part of the humaa female reproductive system do the following events take place?
I    - Release of 1st polar body.
II   - Release of 2nd polar body.
III  - Fertilisation
IV  - Implantation
(b) From where do signals for partuirition originate and what does maternal pituitary release for stimulating uterine contractions for child birth?

3

(a)

Draw a sectional view of human ovary and label the different follicular stages, ovum and Corpus luteum.

3

(a)

Give a schematic representation, showing the events of spermatogenesis in human male.

3

(a)

Name the processes, the spermatogonia & sertoli cells undergo. Define these processes.

3

(a)

Why is breast-feeding recommended during the initial period of an infant's growth ? Give reasons.

3

(a)

Draw a labelled diagram of the embryonic stage that gets implanted in the human uterus. State the functions of the two parts labelled

3

(a)

State any three functions of placenta in human female.

3

(a)