Any seed which contains endosperm or perisperm at maturity is called albuminous or endospermic seed i.e., food reserve of the seed is stored in endosperm or perisperm, e.g. rubber, coconut, castor bean, maize and other cereals. Seed that does not have endosperm at maturity and in which cotyledons absorb food reserve from endosperm during development and act as storage organs is called exalbuminous or non- endospermic seed, e.g., mustard, groundnut, bean, pea etc.