What is the stimulus in :

(a) phototropism

(b) geotropism

(c) chemotropism

(d) hydrotropism

(e) thigmotropism

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Solution

(a) phototropism- light
(b) geotropism - gravity
(c) chemotropism - chemicals
(d) Hydrotropism - water

(e) thigmotropism- touch or physical contact

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