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प्रश्न
Which of the following is a growth movement and which is not?
- Folding up of leaves of sensitive plant on touching with hand.
- Folding up of petals of dandelion flower when light fades.
उत्तर
Neither of them are growth movement. They are nastic movements.
- This is a thigmonastic movement.
- This is a photonastic movement.
APPEARS IN
संबंधित प्रश्न
Tendrils wind around a support in response to ______.
What is meant by positive phototropism and negative phototropism? Give one example of each type.
What is meant by ‘positive geotropism’ and ‘negative geotropism’? Give one example of each type. Draw a labelled diagram to illustrate your answer, indicating the plant part, which shows positive geotropism, and the plant part, which shows negative geotropism.
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?
Dandelion flowers open the petals in bright light during the daytime but close the petals in dark at night. This response of dandelion flowers to light is called:
To which of the following directional stimulus roots of a plant do not respond?
In the given figure (a), (b) and (c), which appears more accurate and why?
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 |
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| (a) | (b) | (c) |
Assertion (A): If the plant part moves in the direction of gravity, it is called positive geotropism.
Reason (R): Stem shows positive geotropism.
Which parts of a plant exhibit Negative geotropism?
Define the following term:
Tropism
