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Q.

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

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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

answer is B.

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