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Answer the Following Question. What is Tropism? - Science

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Question

Answer the following question.
What is tropism?

One Line Answer

Solution

A growing movement of a plant in response to the external stimulus in which the direction of stimulus determines the direction of response is called tropism.

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2019-2020 (February) Delhi(Set 3)

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Which of the following are not tropisms?
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(a) (i) and (ii)  (b) (ii) and (iii)  (c) (i) and (iv)  (d) (ii) and (iv)


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:

  1. What could stimulus A be?
  2. Name the stimulus B.
  3. What could stimulus C be?
  4. 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.

The response of plants to gravity is known as geotropism. How are plant parts sensitive to gravity? Describe with the help of a diagram.


Differentiate phototropism from photonasty.


The opening and closing of the Moonflower is not a tropism because the movement in this is ______.


Give an example for the movement of plant part which is very quick and can be observed easily.


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