Which one of the following plants shows helobial type endosperm?

Endosperm development is of three main types: nuclear, cellular, and helobial.

Helobial endosperm is an intermediate type between nuclear and cellular endosperms. In this type, the first division of the primary endosperm nucleus is followed by the formation of a transverse wall, resulting in two unequal cells: a large micropylar cell and a small chalazal cell. Subsequent divisions in both cells are free nuclear. This type of endosperm is mostly found in monocotyledons, particularly in the order Helobiales.

Asphodelus is a classic example of a plant that exhibits the helobial type of endosperm.

Coconut shows both nuclear (coconut water) and cellular (white kernel) endosperm.

Balsam and Adoxa show cellular endosperm.

Answer: Asphodelus