Multiple choice

Root pressure is maximum when

  1. transpiration is very low and absorption is high

  2. transpiration is very high and absorption is also high

  3. transpiration and absorption both are low

  4. transpiration is high and absorption is low
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Root pressure builds up in roots when water absorption exceeds water loss. This occurs when transpiration is low (minimal water loss from leaves) and absorption is high (active water uptake by roots). Option A correctly identifies this condition. Option B (high transpiration) would reduce root pressure, and Option C (both low) would not generate significant pressure. Option D describes conditions that would deplete water pressure.

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