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Maize grain: Coleoptile.
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In monocotyledons like maize, the coleoptile is a pointed protective sheath that covers the emerging shoot and keeps the monocot embryo's leaf primordia and shoot apex confined. Coleoptiles do not divide but instead, grow in size as more water is accumulated. Coleotiles contain a plant growth regulator auxin, which is responsible for phototropism.
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