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प्रश्न
What is the stimulus in phototropism?
उत्तर
The stimulus in phototropism is Light.
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संबंधित प्रश्न
What does a root do in response to gravity? What is this phenomenon known as?
What does a plant root do in response to water? What is this phenomenon known as?
To which directional stimuli do roots respond?
Name five stimuli which act on plants. Name the type of tropism produced by each one of these stimuli.
The growth of tendrils in pea plants is due to the :
(a) effect of sunlight on the tendril cells facing the sun
(b) effect of gravity on the part of tendril hanging down towards the earth
(c) rapid cell division and elongation in tendril cells that are away from the support
(d) rapid cell division and elongation in tendril cells in contact with the support
The movement of a shoot towards light is:
Which of the following are not tropisms?
(i) growing of pollen tube in response to a sugary substance
(ii) folding up of leaves of sensitive plant in response to touch
(iii) winding of tendril around a support in response to touch
(iv) opening up of the leaves of a daisy flower in response to light
(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:
- What could stimulus A be?
- Name the stimulus B.
- What could stimulus C be?
- 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.
State whether true or false. If false, correct the statement.
The response of a part of plant to the chemical stimulus is called phototropism.
Growth of root towards water is ______.
