Why dicotyledonous seeds are exalbuminous ?
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Some exalbuminous seeds are bean, pea, oak, walnut, squash, sunflower, and radish. Seeds with an endosperm at maturity are termed albuminous seeds. Most monocots (e.g. grasses and palms) and many dicots (e.g. brazil nut and castor bean) have albuminous seeds. All gymnosperm seeds are albuminous.
The kernel in dicotyledonous exalbuminous seeds is the embryo. In it the two fleshy cotyledons are very conspicuous. These arc fleshy as all the nutrients required by the growing seedling in the first few days are kept stored here. The two cotyledons are hinged to an axis (tigellum) so that they open out like a book.
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