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(a) What is meant by positive tropism an...

(a) What is meant by positive tropism and negative tropism? Explain with examples.
(b) Define thigmotropism. Give one example of thigmotropism.
(c) What is the difference between thigmotropism and thigmonasty? Name one plant which exhibits thigmotropism and one plant which exhibits thigmonasty. What behaviour (or responses) of these plants make you think that they exhibit thigmotropism and thigmonasty respectively?

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LAKHMIR SINGH & MANJIT KAUR-CONTROL AND COORDINATION -Exercise
  1. (a) Define geotropism. Give one example of geotropism. (b) What is m...

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  2. (a) How does control and coordination take place in plants? How does i...

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  3. (a) What is meant by positive tropism and negative tropism? Explain wi...

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  4. Which of the following is not a plant hormone?

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  5. One of the following plant hormones is responsible for the phenomenon ...

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  6. The movement of a plant part in response to the force of attraction ex...

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  7. The movement of sunflower in accordance with the path of the sun is du...

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  8. The plant part which exhibits negative geotropism is:

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  9. A big tree falls in a forest but its roots are still in contact with t...

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  10. Which of the following is not caused by a growth movement?

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  11. The root of a plant is: (i) positively phototropic but negatively g...

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  12. The main function of the plant hormone called abscisic acid is to:

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  13. The growth of tendrils in pea plants is due to the:

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  14. Which of the following phytohormone is not associated with the promoti...

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  15. The plant hormone which triggers the fall of mature leaves and fruits ...

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  16. Which of the following terms denotes the movement of the root of a pla...

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  17. The growth of a pollen tube towards the ovule caused by a sugary subst...

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  18. The bending of the shoot of a plant in response to light is called:

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  19. The stimulus in the process of thigmotropism is:

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  20. A growing seedling is kept in a dark room. A burning candle is placed ...

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