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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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Primary endosperm centre constantly divides and triploid endosperm tissue is produced. The cells of this tissue possess mass of stored food and it is used for nutrition of developing embryo. Embryo develops at the end of micropyle where zygote is located. Many zygotes develops after becoming some amount of endosperm. This is a type of adaptation where developing embryo gets nutrition in definite way
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