Root pressure is maximum when

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(B) Root pressure is the positive pressure that develops in the xylem sap of roots due to the active absorption of mineral nutrients from the soil.Whe

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Transpiration is very low and absorption is high

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(B) Root pressure is the positive pressure that develops in the xylem sap of roots due to the active absorption of mineral nutrients from the soil.When the rate of transpiration is very low (e.g.,at night or during early morning) and the rate of water absorption is high,water accumulates in the xylem vessels.This accumulation of water creates a positive hydrostatic pressure known as root pressure,which helps in pushing the water column upwards in small herbaceous plants.

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