(a) Define geotropism. Give one example ...

(a) Define geotropism. Give one example of geotropism.
(b) What is meant by 'positive geotropism' and negative geotropism? Give one example of each type. Draw a labelled diagram to illustrate your answer indicating the plant part which shows positive geotropism and the plant part which shown negative geotropism.
(c) Name one plant part which exhibits positive thigmotropism.

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