When transpiration is not occurring the rate of ascent of sap
a Stops
b Increases
c Remain unaffected
d Increase in the beginning & then stops

Dear Student,
Please find below the solution to the asked query:
The correct option is (a) stops.
Transpiration is the process in which the water is lost through the stomatal openings or the tiny pores .
Ascent of sap: It is the upward movement of the sap (essential liquid nutrient) or water.
The water along with dissolved minerals is taken up through the roots & then the tissues like xylem takes it to the leaves & other parts, this is what ascent of sap is! Transpiration is necessary for ascent of sap because this force which is generated in leaves is responsible for upward movement of water filled in xylem tracheids and vessels. This theory is called transpiration pull and cohesion tension theory  
Hope this information will clear your doubts about the topic.
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