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

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.

Why does leather get hardened after tanning ?

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

Choose the correct allternativ The central cell after triple fusion becomes primary endosperm nucleus /embryo.

Centromeres divide in which phase of cell division?

Give reason for the following In angiosperms, one of the male gametes fuses with egg to form zygote and second male gamete fuses with polar nuclei to form primary endosperm nucleus.

Where does the first cleavage division of zygote take place?

QUESTIONS FROM CBSE BOARD EXAMINATIONS : In angiosperms, zygote is diploid, while primary endosperm cell is triploid. Explain.