The chief role of transpiration in plants is to

Remove surplus water

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Cooling of the plant

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Increase ascent of sap

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Uptake rise of minerals

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Solution

The correct option is C Increase ascent of sap
According to the most widely accepted theory, ascent of sap occurs through 'Cohesion Tension' or 'Cohesion Transpiration pull'. The cohesion and adhesion forces give rise to a continuous water column in xylem elements, which is lifted by the transpiration pull. Thus, ascent of sap is purely physical process and does not involves energy input.

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Transpiration helps in the ascent of sap by producing a suction force acting from the bottom of the plant.

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