Q. 725.0( 1 Vote )

While conducting experiments to study the effect of various stimuli on the plants, it was observed that the roots of a plant X grow and bend towards two stimuli A and B but bend away from a third stimulus C. The stem of the plant X, however, bends away from stimuli A and B but bends towards the stimulus C. The stimulus B is known to act on the roots due to too much weight of the earth. Keeping these points in mind, answer the following questions:

(a) What could stimulus A be?

(b) Name the stimulus B.

(c) What could stimulus C be?

(d) The branches of a fallen tree in a forest grow straight up in response to two stimuli. What could be these two stimuli out of A, B and C? Also name these two stimuli.

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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