Root pressure may be caused by

Osmotic flow of water into xylem of absorbing part of root.

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Loss of water from xylem of the plant due to transpiration.

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Low water potential of leaves.

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High water potential of leaves.

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Solution

The correct option is A Osmotic flow of water into xylem of absorbing part of root.
When there is no transpiration then due to lack of transpiration pull water does not move upwards. At this time through osmosis water is absorbed from the soil and it accumulates in xylem region of the root .The accumulation through osmosis causes root pressure and water moves upwards.
Thus, the correct option is (A).

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