Question

Study the figures given below showing initial stages in the formation of female gametophyte and answer the questions that follow. (i) Identify (P) and (Q). (ii) I. What kind of division does cell (P) undergo to form (Q)? II. 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.

Explain the structure of a mature embryo sac of a typical flowering plant.