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Which of the following are not tropisms?...

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)

Text Solution

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The correct Answer is:
D
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LAKHMIR SINGH & MANJIT KAUR-CONTROL AND COORDINATION -Exercise
  1. The bending of the root of a plant away from a source of light is caus...

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  2. The plant part which exhibits negative geotropism is:

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  3. Which of the following are not tropisms? (i) growing of pollen tube...

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  4. The chemical substance P is made and secreted by the meristematic tiss...

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  5. A potted plant is growing in a transparent glass jar. In this plant, X...

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  6. There are three plants A,B and C. the flowers of plant A open their pe...

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  7. While conducting experiments to study the effect of various stimuli on...

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  8. P and Q are two types of plants having weak stems which cannot stand u...

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  9. The top part A of the flask-shaped reproductive organ X in the flower ...

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  10. P,Q,R and S are four major types of phytohormones. P is a phytohormone...

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  11. A potted plant having straight parts A and B was placed horizontally o...

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  12. When the leaves of a sensitive plant are touched with a finger, they f...

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  13. Name the two systems of control and coordination in higher animals.

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  14. What are the two parts of the vertebrate nervous system?

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  15. If we happen to touch a hot object unknowingly, we immediately pull ba...

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  16. Name the three components of a neuron (or nerve cell).

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  17. (a) What are the short fibres of a neuron known as? (b) What is the ...

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  18. Name the most important part of the human brain.

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  19. Which part of the brain maintains posture and equilibrium of the body?

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  20. State one function each of cerebellum and pons.

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