(b) Answer the following questions :
- (i) Label A, B, C and D in the figure.
- (ii) What will be the number of chromosomes in secondary spermatocyte and spermatid respectively?
- (iii) Explain the terms Spermiogenesis and Spermiation.
OR
Study the figures given below showing initial stages in the formation of female gametophyte and answer the questions that follow. [Figures P and Q are implied, showing Megasporogenesis]
- (i) Identify (P) and (Q).
- (ii) What kind of division does cell (P) undergo to form (Q)? How many (Q) cells form the embryo sac? What is the name given to such kind of development?
- (iii) How many free nuclear mitotic divisions will the functional megaspore undergo to form the embryo sac?
- (iv) Describe the structure of a mature female gametophyte.