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(a) Negative Geotropism;
(b) Due to gravity: auxins migrate to the lower side of the shoot; This causes a high auxin concentration on the lower side than on the upper side; The higher auxin concentration causes rapid cell multiplication and elongation on the lower side than on the upper side; causing upward curvature/growth;
(c) Enables the shoot to grow upwards so as to expose leaves to sunlight for photosynthesis;
sharon kalunda answered the question on September 16, 2019 at 14:24
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