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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 Question : (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. - CBSE Class 10 - Science

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Question

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 question :
(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.

Solution

(a) The stimulus A is water.
(b) The stimulus B is gravity.
(c) The stimulus C is light.
(d) The two stimuli responsible for the straight growth of the branches of a fallen tree are B and C, i.e., gravity and light, respectively.

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APPEARS IN

 Lakhmir Singh Solution for Biology for Class 10 (2018 to Current)
Chapter 2: Control and Coordination
Q: 72 | Page no. 97

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Solution 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 Question : (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. Concept: Coordination in Plants - Movement Due to Growth.
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