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Why does the zygote divides only after t...

Why does the zygote divides only after the division of Primary endosperm cells ?

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(i) Zygote requires nourishanment during its development.
As ,mature, fertilized embryo sac offers very little nourshment to the zygote, the primary endosperm cell (PEC) divides and generates the endosperm tissue which nourishes the zygote.
(iii) Hence the zygote always divides after division of PEC.
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