First slide

Pre-fertilisation : Structures and Events

Question

Mark the correct sequence of events that takes place during formation of embryo sac.

Easy

A

Megaspore → Megaspore Mother Cell→ Embryo sac
B

Nucellus→ Megaspore Mother Cell→ Megaspore→ Embryo sac
C

Megaspore Mother Cell→ Megasporangium→ Megaspores→ Egg
D

Megasporophyll → Ovule→ Ovary→ Embryo sac

Solution

Nucellus (2n) → Megaspore Mother Cell(2n)→ Megaspore(n)→ Embryo sac(n)
A micropylar cell of nucellus usually differentiates to function as megaspore mother cell (2n). It undergoes meiosis to form megaspore(n). The functional megaspore forms the female gametophyte or embryo sac.

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