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Which is the most common type of embryo sac in angiosperms?

1. Bisporic with two sequential mitotic divisions.
2. Tetrasporic with one mitotic stage of divisions.
3. Monosporic with three sequential mitotic divisions.
4. Monosporic with two sequential mitotic divisions.

Correct answer: Monosporic with three sequential mitotic divisions.

Solution

The most common embryo sac in angiosperms is the Polygonum type, which is monosporic and develops from one functional megaspore. That megaspore undergoes three successive mitotic divisions to produce the typical 8-nucleate embryo sac.

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