The rise of water in the xylem as an unbroken column depends mainly on
Correct answer: C. cohesion between water molecules caused by hydrogen bonding
- A. the low viscosity of water
- B. the high density of water
- C. cohesion between water molecules caused by hydrogen bonding
- D. the fact that water is a poor solvent for gases
Explanation
Hydrogen bonds make water molecules stick to one another, so a column pulled by evaporation at the leaves does not break, and adhesion to the walls of the narrow xylem vessels supports the column as well. The same cohesion gives water its high surface tension, which lets small insects rest on a pond. Viscosity and density play no part in maintaining the transpiration stream.
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About Biological Importance of Water
Water supports life through its polarity, hydrogen bonding and ability to dissolve ionic and polar substances. Its high specific heat, heat of vaporization, cohesion, adhesion and incompressibility help regulate temperature, transport materials and maintain structure, while hydrolysis and osmosis depend directly on water.
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