$A$ : The storage region of maize grain is whitish or yellow.

$R$ : It is rich in protein granules.

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

An example of a seed with endosperm, perisperm, and caruncle is

Micropyle in seed helps in the entry of

Identify $A, B, C$ and $D$ in the given diagram