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Endosperm is a nutritive tissue formed during double fertilization in angiosperms and shows considerable variation in its mode of development. Based on the pattern of nuclear division and cytokinesis, three main variants of endosperm are recognized: nuclear, cellular, and helobial endosperm. Nuclear endosperm is the most common type and is found in a majority of angiosperms such as cereals, cotton, and sunflower. In this type, ______ __________ ____ ____ _____ ________ ___ _____.
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