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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PREVIOUSThere are three plants A, B and C. The flowers of plant A open their petals in bright light during the day but close them when it gets dark at night. On the other hand, the flowers of plant B open their petals at night but close them during the day when there is bright light. The leaves of plant C fold up and droop when touched with fingers or any other solid object.(a) Name the phenomenon shown by the flowers of (i) plant A, and (ii) plant B.(b) Name one flower each which behaves like the flower of (i) plant A, and (ii) plant B.(c) Name the phenomenon exhibited by the leaves of plant C.(d) Name a plant whose leaves behave like those of plant C.(e) Which plant/plants exhibit the phenomenon based on growth movements?NEXTP and Q are two types of plants having weak stems which cannot stand upright on their own. The plants P and Q have organs R and S respectively which can grow towards any support which they happen to touch and wind around that support. It is- observed that organ R originates from the leaves of the plant whereas organ S originates directly from the stem of the plant.(a) What is (i) R, and (ii) S?(b) What is the name of growth movement exhibited by the organs R and S?(c) Name the stimulus involved in this case.(d) State whether the behaviour of organs R and S is a tropic movement or a nastic movement.(e) Name one plant like P and another plant like Q.
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