Observe the given diagram and answer the questions given below:
The method of embryo sac formation from a single megaspore is termed__________ development.
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → Monosporic
The megaspore mother cell divides by meiosis to give four megaspores. In most flowering plants three of them degenerate, and only one, the functional megaspore, forms the embryo sac.
Option (2) Monosporic — Correct. The embryo sac forms from one functional megaspore; the other three degenerate. Development from a single megaspore is called monosporic development.
NCERT Extract:
The Pistil, Megasporangium (ovule) and Embryo Sac – “… Female gametophyte : In a majority of flowering plants, one of the megaspores is functional while the other three degenerate. Only the functional megaspore develops into the female gametophyte (embryo sac). This method of embryo sac formation from a single megaspore is termed monosporic development.”