GCSE Science/Plant sensitivity and transport

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Plant sensitivity involves the plant making auxins which are growth hormones. Secreted at a special part of the plant depending on plant sensitivity. In terms of geotropism - sensitivity to gravity , the plant stem grows upwards (negative tropism) and plant root downwards (positive tropism) Phototropism - sensitivity to sun light as plants all need sunlight to photosynthesize , plant grows towards the sunlight meaning that auxins are secreted in large quantities on the side where less light , creating a bend on stem , as an unbalanced growth growing towards light.