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Question
During absorption of water by roots, the water potential of cell sap is lower than that of
During absorption of water by roots, the water potential of cell sap is lower than that of
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Solution
The correct option is D pure water and soil solution
Water potential is the difference in chemical potential of water in a system over its pure state at the same temperature and pressure. The water potential of pure water is zero. If some solute is dissolved in pure water, the solution has fewer free water and the concentration of water decreases, reducing its water potential. Hence, all solutions have a lower water potential than pure water and water potential is negative for any solution. At the same time, water moves from the higher water potential to the lower water potential. During absorption, water moves from soil to the root which means the water potential of cell sap of root is lower than that of soil. Thus, the cell sap will have a water potential lower than the pure water and soil solution during absorption.
Water potential is the difference in chemical potential of water in a system over its pure state at the same temperature and pressure. The water potential of pure water is zero. If some solute is dissolved in pure water, the solution has fewer free water and the concentration of water decreases, reducing its water potential. Hence, all solutions have a lower water potential than pure water and water potential is negative for any solution. At the same time, water moves from the higher water potential to the lower water potential. During absorption, water moves from soil to the root which means the water potential of cell sap of root is lower than that of soil. Thus, the cell sap will have a water potential lower than the pure water and soil solution during absorption.
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