The main functions of the integuments are:
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The integuments surround the nucellus (sporophytic tissue) except at the micropylar region there by protecting it.
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The integument near the micropyle in the Castor divides and forms the Caruncle. The caruncle is considered as the third integument.
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The inner integument becomes specialized to form the endothelium. Endothelium gives nourishment to the embryo sac.
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The integument develops into seed coat.
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The seed coats also protect the seed and the embryo present inside it.
