MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY
Transpiration in plants. A stick of celery is split and put in two beakers of food colouring. After a few hours the xylem are stained with the dye. This experiment demonstrates how capillary action is used by plants to transport water molecules up xylem vessels to the leaves.
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