Addition of salts and other solutes from other cells into xylem sap, __________ the water potential of the xylem sap
Correct answer: B. Lowers.
- A. Increases.
- B. Lowers.
- C. Doesn't effect.
- D. Maintains.
Explanation
Adding salts and other solutes makes the xylem sap more concentrated, which lowers its water potential. Water therefore has a greater tendency to move toward that solution by osmosis or along a water-potential gradient. Students may choose increases because more dissolved material means a larger numerical solute concentration, but water potential becomes more negative as solute concentration rises.
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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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