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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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(a) Parts of the ovule showing a large megaspore mother cell, a dyad and a tetrad of megaspores; 

(b) 2, 4 and 8-nucleate stages of embryo sac and a mature em bryo sac; 

(c) A diagrammatic representation of the mature embryo sac.

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