Answer :

(a) Stimulus A could be water as roots show the positive hydrotropism.

(b) Stimulus B could be gravity as roots show the positive geotropism.

(c) Stimulus C could be light as roots show the negative phototropism.

(d) The two stimuli could be B (gravity) and C (light).

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How does phototroLakhmir Singh & Manjit Kaur- Biology