Problem: Is water mostly pushed up the tree from the roots or pulled up the tree from the leaves? Briefly explain

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Water moves towards the top of a tree mainly with the help of root pressure and transpiration. 

  • Root Pressure: This occurs when soil moisture is high at night or when transpiration is low during the day. The water flows into the roots towards the stem through osmosis. Accumulation of water in the xylem provides a force which pushes the water upward. 
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Is water mostly pushed up the tree from the roots or pulled up the tree from the leaves? Briefly explain