... sap upwards. Root pressure may push the water up a bit, but this still doesn't account for water movement to the top of a tall tree. Less than one percent of the water in a tree that actually reaches the leaves is used in photosynthesis and plant growth because most of it is lost in a process called transpiration. Transpiration provides two basic functions: it provides the ... transporting water to great heights against gravity. Water molecules are polar and adhere to walls of vessel elements. Water molecules are also cohesive so they stick together. In a sense, the cohesion of water mo...

• Word Count: 802
• Approx Pages: 3
• Has Bibliography
• Grade Level: High School