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Explain with the help of a diagram the d...

Explain with the help of a diagram the development of a mature embryo sac from a megaspore mother cell in angiosperm

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Parts of the ovule showing a large megaspore mother cell, a dyad and a tetrad of megaspores,
2,4 and 8-nucleate stages of embryo sac and a mature embryo sac,
A diagrammatic representation of the mature embryo sac.
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