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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 ______ ____ _________ ________ _______ __________ ______ __________ _______.
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