Went's Experiment III | Biology
F. W. Went found that when the tip of Avena coleoptile is cut, its elongation ceases. However, when auxin was added externally, its growth renewed. He suggested that experiments suggested that auxin is synthesized in the coleoptile tip and is translocated downwards towards the gravity. It moves from the illuminated side to the shaded side. More auxin is present on the shaded side than on the illuminated side. Due to this, the plant to grow more on the shaded side and bend in the direction of the light source. It shows positive phototropism where faster cell elongation is seen on the shaded side and less on the illuminated side.
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