How are seeds classified baed on the presence of absence of the endosperm?

Explanation

Based on the presence or absence of the endosperm the seed is of two types.
(i) Albuminous or Endospermous seed: The cotyledons are thin,membranous and mature seeds have endosperm persistent and nourishes the seedling during its early development, eg. Castor, sunflower, maize.
(ii) Ex-albuminous or non-endospermous seed: Food is utilized by the developing embryo and so the mature seeds are without endosperm. In such seeds, cotyledons store food and become thick and fleshy, eg. Pea, Groundnu