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Structures of seed-Describe endosperm

Write down the typical structures of seed? And also describe the term endosperm?

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A typical seed is composed of embryo, endosperm and shell. In seeds of the angiosperms there are one or two cotyledons (seed leaf, one in the monocots, two in the dicots). The endosperm is tissue in the seed which has the function of nourishing the embryo.

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