LABORATORY REVIEW
DIFFUSION AND OSMOSIS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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What causes water to enter plant roots from the soil?
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Water potential in root hairs and the soil is equal.
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Water potential in root hairs and xylem is equal.
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Water potential in root hairs is higher than in the soil.
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Water potential in root hairs is lower than in the soil.
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Explanation:
Detailed explanation-1: -Water moves into the roots from the soil by osmosis, due to the low solute potential in the roots (lower s in roots than in soil).
Detailed explanation-2: -Capillary action helps bring water up into the roots. But capillary action can only “pull” water up a small distance, after which it cannot overcome gravity. To get water up to all the branches and leaves, the forces of adhesion and cohesion go to work in the plant’s xylem to move water to the furthest leaf.
Detailed explanation-3: -Water potential of root cells is higher than water potential of soil.
There is 1 question to complete.