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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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Division and storage of food in primary endosperm cell forms endosperm which is pre-requirement for developing embryo, which is formed due to division of zygote.
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Why does the zygote in angiosperms start developing into embryo only after some endosperm is formed?

Which cells do not divide after birth ?

The central cell after triple fusion becomes primary endosperm nucleus/embryo.

How does the zygote differ from other cells of the body ?

After double fertilization, most zygotes divide only after certain amount of endosperm is formed. One of the importance of this adaptation is

In double fertilisation, one male gamete fuses with the (i) to form zygote and the other male gamete fuses with (ii) to form primary endosperm nucleus.

Why is cell division necessary?

Assertion :- Most zygotes divide only after certain amount of endosperm is formed. Reason :- This is an adaptation to provide assured nutrition to the developing embryo.