What is depicted by "$X$" and "$Y$" in the following diagram?

Which cell acts as the vital link that ensures continuity of species between organisms of one generation and the next?

$A$: Complete radicle is not produced by the hypo-basal tier of the octant embryo during Crucifer-type development.
$R$: The hypophysis cell of the suspensor contributes to the tip of the radicle in this type of development.

In angiosperms,the oospore on development produces

The scutellum observed in a grain of wheat or maize is comparable to which part of the seed in other monocotyledons?

Select the incorrect statement regarding the embryo of angiospermic plants.