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Q.

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

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a

Nucellus→ Megaspore mother cell→ Megaspore→ Embryo sac

b

Megaspore → Megaspore mother cell→ Embryo sac

c

Megaspore mother Cell→ Megasporangium→ Megaspores→ Egg

d

Megasporophyll → Ovule→ Ovary→ Embryo sac

answer is B.

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Detailed Solution

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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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