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Comment 22 by DavidMcC

Jussie, it's quite simple. The rate of elongation of a stem is reduced by incident light. The plant does not have to form an image of where the sun is, the light just bends its stems automatically. This has long been known.

Thanks. So the side of the stem facing the light grows slower than the other, causing it to bend towards the light source. Simple enough.

Permalink Mon, 03 Oct 2011 12:38:36 UTC | #877388

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