Endosperm is formed as a result of double-fertilisation. Endosperm nourishes the developing embryo during seed development. In plants such as bean, gram and pea, the endosperm is not present in the mature seed because the endosperm is completely consumed during development of seed. Such seeds are called nonendospermic or exalbumious. In monocots and caster bean (dicot) embryo do not consume all endosperm during seed development. So it persists in the mature seeds. Such seeds are called endospermic or albuminous seed