C.

smaller and to have smaller sex organs

As we proceed from thallophyta to angiosperms, there is gradual reduction in gametophte with reduced size of sex organs. From thallophyta to angiosperms, there is progressive elaboration of sporophytes. 

B.

Autogamy and geitonogamy

C.

no dependence on pollinators

In cleistogamous flowers, anthers and stigma lie close each other. When anthers dehisce in the flower buds, pollen grains come in contact with the stigma to effect pollination. Thus, these flowers produce assured seed set even in the absence of pollinators. The higher genetic variability and more vigorous offsprings are the produced to variations obtained by sexual reproduction. Vivipary relates to the birth of young babies from mammals.

A.

α-amylase

Barely seeds are rich in carbohydrate (Starch). The starch is hydrolysed by α-amylase to monosaccharides unit at the time of germination of seeds.

D.

castor

The seeds of castor (Ricinus communis, family -Euphorbiaceae) are endospermic dicot seeds. They possess  endosperm which acts at the food storgage tissue of seed. They also possess perisperm and cruncle.