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

(b) What is meant by ‘positive geotropism’ and ‘negative geotropism ? Give one example of each type.

(c) Name one plant part which exhibits positive thigmotropism.

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(a) The movement of plant part in response to gravity is called geotropism. 

Example – Roots grow towards gravity. 

(b) If the plant part moves towards the direction of gravity, it is called positive geotropism. 

Example – Roots. If the plant part moves against the direction of the gravity it is negative geotropism. 

Example – Stem

(c) Tendrils.

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