Multiple choice The transport of water by xylem in tall trees occurs mainly due to metabolic activity in xylem cells root pressure exerted by absorbed water capillary rise in xylem open pipes transpiration pull and cohesion of water molecules Reveal answer Fill a bubble to check yourself D Correct answer Explanation By utilizing capillary action and the inherent surface tension of water, transpiration pull and cohesion force transport the water by xylem in tall trees.