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The bending of the shoot of a plant in response to light is called : (a) geotropism (b) phototropism (c) thigmotropism (d) photonasty - Science

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Question

The bending of the shoot of a plant in response to light is called :
(a) geotropism
(b) phototropism
(c) thigmotropism
(d) photonasty

Solution

(b) phototropism

Photo means light and tropism means movement. The bending of plant shoots in response to light is called phototropism.

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Chapter 2: Control and Coordination - Exercise 1 [Page 95]

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Lakhmir Singh Biology (Science) [English] Class 10
Chapter 2 Control and Coordination
Exercise 1 | Q 52 | Page 95

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What is the stimulus in geotropism?


What does a root do in response to light? What is this phenomenon known as?


 Define hydrotropism. Give one example of hydrotropism. State whether this example is of positive hydrotropism or negative hydrotropism. Illustrate your answer with the help of labelled diagram.


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state two ways in which the above two processes differ.


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(a) (b) (c)
 

The figure given below depicts a kind of tropic movement in plants. Study the same and answer the following questions:

  1. What kind of a movement is shown in the figure? Define it.
  2. How does this movement differ from geotropism?
  3. Name the stimulus responsible for thigmotropism. Give one example of a plant showing thigmotropism.
  4. Name one stimulus which gives a positive response for the roots but a negative response for the shoot.
  5. Draw a neat and labelled diagram of the part of a plant showing leaf tendril. Name the plant.

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