Endosperm, a product of double fertilization in angiosperms is absent in the seeds of

The correct option is D Orchids
Coconut:

Coconut has liquid endosperm which later gets developed into solid tissue.

Orchids:

Orchids do not have an endosperm in their matured seeds as they consumed during embryonic development.

Maize:

Maize has a large, bulky endosperm that constitutes a considerable portion of its dry weight.

Castor:

The endosperm of castor contains reserve food materials like protein bodies.

Final answer:

b. Orchids