A : Root pressure is dynamic and is always a | vedclass

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(C) Root pressure is defined as the positive hydrostatic pressure that develops in the xylem sap of roots due to the active absorption of mineral ions

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Assertion is correct,but Reason is incorrect.

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(C) Root pressure is defined as the positive hydrostatic pressure that develops in the xylem sap of roots due to the active absorption of mineral ions.It is a dynamic process because it depends on the metabolic activity of root cells.However,root pressure is not a universal phenomenon; it is observed only in certain plants under specific conditions (e.g.,high soil moisture and low transpiration).It typically develops when the rate of water absorption is greater than the rate of transpiration,often referred to as an absorption lag or during periods of low transpiration like the night.Since the Assertion is correct but the Reason claims it is a universal phenomenon (which is false),the correct option is $C$.

$A$ : Root pressure is dynamic and is always a positive hydrostatic pressure.
$R$ : It is a universal phenomenon and develops under absorption lag.

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$A$ : Root pressure is dynamic and is always a positive hydrostatic pressure.$R$ : It is a universal phenomenon and develops under absorption lag.