Question : Water moves up against gravity and even for a tree of 20mheight the tip receives water within two hours . The most important physiological phenomenon which is responsiblefor the upward movement of water is "______"

Question : Water moves up against gravity and even for a tree of 20mhe

1.	Question : Water moves up against gravity and even for a tree of 20mheight the tip receives water within two hours . The most important physiological phenomenon which is responsiblefor the upward movement of water is "______"
Answer» guttation evaporation transpiration none of these. Solution : According to transpiration pull theory due to transpiration the WATER column inside the plant comes under tension This is called transpiration pull On account of this tension, the water column is PULLED up PASSIVELY from below to top of the plant (almost LIKE a rope).A tension of one atmosphere is sufficient to pull water to a heigher of about `20` METERS.