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Water climbing up a narrow tube against gravity is driven by adhesion -- the attraction between water molecules and a different surface. What is this upward movement itself called?
ACohesion
BCapillary action
COsmosis
DDiffusion
Answer & Solution
Correct answer: B. Capillary action
1. Adhesion between water and a solid surface (like the inside of a thin tube) can pull the water column upward.
2. The text states: "This type of adhesion is called capillary action."
3. Cohesion is water-to-water attraction (a related but different phenomenon), while osmosis and diffusion describe movement of substances across concentration gradients, not this surface-adhesion effect.
4. So the upward creep of water in a thin tube, driven by adhesion, is called capillary action.
_Source: OpenStax Biology Ch 2 "The Chemical Foundation of Life", p.50 §2.2 | Water_
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