In angiosperms,the embryo is developed at . . . . . . of the embryo sac.

What do '$a$','$b$','$c$',and '$d$' represent in the given figure?

Meroblastic type of embryo development takes place in

The scutellum is a ......... .

Starting with the zygote,draw the diagrams of the different stages of embryo development in a dicot.

$A$: 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.