Question

How does transpiration occur in very tall trees?


■Most of the excess water in tall trees is given off by the bark
■A suction pull from the leaves causes transport to great heights
■Excess water in taller trees can only be evaporated by lower branches
■Excess water acts against gravity by pushing water towards all branches​

Answer 1

The correct answer is option (b) A suction pull from the leaves causes transport to great heights.

• Transpiration is the evaporative loss of water by plants.
• It occurs mainly through the stomata in the leaves.
• The water reaches great heights in the trees because of the suction pull that is caused by the transpiration process.  
• Hence Water reaches great heights in the trees because of the suction pull caused by Transpiration.