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Formation of embryos without meiosis and...

Formation of embryos without meiosis and syngamy ……… .

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Formation of embryo sac from nucellar cell after degradation of megaspores.

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(A) Draw the embryo sac of a flowering plant and label (i) central cell (ii) chalazal end of the embryo sac and (iii ) synergids. (b) Name the cell that develops into the embryo sac and explain how this cell leads to the formation of embryo sac. Also mention the role played by the various cells of the embryo sac .