The functional megaspore undergoes

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(B) The functional megaspore undergoes $3$ successive free nuclear mitotic divisions to form an $8$-nucleated embryo sac. First,the nucleus of the fun

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$3$ mitotic divisions to form mature embryo sac

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(B) The functional megaspore undergoes $3$ successive free nuclear mitotic divisions to form an $8$-nucleated embryo sac. First,the nucleus of the functional megaspore divides mitotically to form two nuclei,which move to the opposite poles. These two nuclei undergo two more successive mitotic divisions,resulting in the formation of $4$-nucleate and later $8$-nucleate stages of the embryo sac.

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