When is the root pressure lowest?

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(A) Root pressure is a positive pressure that develops in the xylem of roots due to the active absorption of mineral ions from the soil,followed by wa

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When transpiration is high and absorption is low

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(A) Root pressure is a positive pressure that develops in the xylem of roots due to the active absorption of mineral ions from the soil,followed by water uptake via osmosis.Root pressure is most observable when transpiration is low (e.g.,at night or early morning) and absorption is high,as this allows water to accumulate in the xylem.Conversely,when transpiration is high,the water column is pulled upward by the transpiration pull,which often exceeds or masks the effect of root pressure.Therefore,root pressure is lowest when transpiration is high and absorption is low,as the water is lost rapidly through the leaves and cannot build up the necessary positive pressure in the roots.

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