What roles does pituitary gonadotrophins play during follicular and ovulatory phases of menstrual cycle? Explain the shifts in steroidal secretions. 

5

(a)

The zygote passes through several development stages till implantation.Describe each stage briefly with suitable diagrams.

5

(a)

Describe the specific action of FSH, LH, oestrogen and progesterone in the menstrual cycle.

5

(a)

Study the graph given below and answer the questions that follow.

(i) Name the hormones 'X' and 'Y'.
(ii) Identify the ovarian phases during menstrual cycle.
(a) 5th-12th day of the cycle.
(b) 14th day of the cycle.
(c) 16th-25th day of the cycle.
(iii) Explain the ovarian events (a), (b) and (c) under the influence of hormones 'X' and 'Y'

5

(a)

With reference for events starting from menstrued cycle till the events of parturition give the name of the hormones involved at each stage and explain their role.

5

(a)