The milky water of a green coconut is:

Why does the zygote begin to divide only after the division of the Primary Endosperm Cell $(PEC)$?

Coconut water from a tender coconut is

Assertion: Endosperm is a nutritive tissue and it is triploid.
Reason: Endosperm is formed by the fusion of the secondary nucleus with the second male gamete. It is used by the developing embryo.

The fusion product of polar nuclei and a male gamete is:

The first cell of the endosperm tissue is: