The part of monocot seedlings that was critical in early studies of phototropism and auxin is the

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The coleoptile is a protective sheath that covers the emerging shoot (plumule) of monocot seedlings. It contains cells that are highly responsive to auxin, and as a result, the coleoptile is critical in early studies of phototropism and auxin. The bending of the coleoptile towards a light source is a classic example of phototropism, and it has been shown that the cells on the shaded side of the coleoptile have a higher concentration of auxin than cells on the illuminated side, causing the coleoptile to bend towards the light.

The Part of Monocot Seedlings That Was Critical in Early