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Why does the zygote begin to divide only...

Why does the zygote begin to divide only after the division of primary Endosperm cell (PEC)?

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The zygote needs nourishment during its development . As the mature, fertilised embryo sac offers very little nourishment to the zygote , the PEC divides and generates the endosperm tissue which nourishes the zygote . Hence, the zygote always divides after division of PEC
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