Name the type of interaction seen between fig and wasps.

Explain the application of rDNA technology to produce insulin.

OR

(a) Describe the different steps in one complete cycle of PCR.

(b) State the purpose of such an amplified DNA sequence.

(a) Describe in sequence the process of microsporogenesis in angiosperms.

(b) Draw a labelled diagram of a two celled final structure formed.

OR

(a) Draw a sectional view of a seminiferous tubule of human. Label sertoli cell, spermatagonia and leydig cell on it and write their functions.

(b) Explain the role of pituitary and sex hormones in the process of spermatogenesis

Why do we add an inoculum of curd to milk for curdling it?

Koel is clever enough to lay eggs in a Crow’s nest. Write the reason for this peculiar behaviour. Name the type of interaction.