In angiosperm, the haploid, diploid and triploid structures of a fertilized embryo sac sequentially are :

Given below are two statements : One labelled as Assertion A and the other labelled as Reason R :

Assertion A : In gymnosperms the pollen grains are released from the microsporangium and carried by air currents.

Reason R : Air currents carry the pollen grains to the mouth of the archegonia where the male gametes are discharged and pollen tube is not formed.

In the light of the above statements, choose the correct answer from the options given below :

The residual persistent part which forms the perisperm in the seeds of beet is

In general the egg apparatus of embryo sac in angiosperm consists of