The growth or movement response of an organism to stem direction; orientation based on the plant stem's position or presence.
From Greek 'kaulos' (stem) + 'taxis' (arrangement/movement). Uses the '-taxis' suffix meaning directional response, common in biological terminology.
Parasitic plants exhibit negative caulotaxis—they grow AWAY from host stems because they need to find the roots to parasitize; it's an evolved behavior written into their cells!
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