Why does the zygote in angiosperms start developing into embryo only after some endosperm is formed?

Long Answer Questions Five mark Each QUESTIONS FROM CBSE BOARD EXAMINATIONS : Give reasons why : (i) most zygotes in angiosperms divide only after certain amount of endosperm is formed. (ii) groundnut seeds are exalbuminous and castor seeds are albuminous. (iii) micropyle remains as a small pore in the seed coat of a seed. (iv) integuments of an ovule harden and the water content is highly reduced as the seed matures. (v) apple and cashew are not called true fruits.

In angiosperms, during development of embryo, the suspensor cells develop from

Mouth develops first in the embryo and anus is formed later in

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

How does endosperm of angiosperms become triploid ?

Why does leather get hardened after tanning ?