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प्रश्न
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?
उत्तर
| Thigmotropism | Thigmonasty |
| It is a directional movement of plant parts in response to touch. | It is a non-directional movement of plant parts in response to touch. |
| Example: Bitter gourd | Example: Mimosa pudica |
Bitter gourd exhibits thigmotropism as its tendrils show directional movement towards the things they happen to touch.
On the other hand, Mimosa pudica exhibits thigmonasty as its leaflets show non-directional movement in response to touch.
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संबंधित प्रश्न
Name the type of chemical substances that control the growth in plants.
Give the scientific terms used to represent the Bending of a shoot towards light.
How does phototropism occur in a plant stem (or shoot)? Explain with the help of labelled diagrams.
What is meant by positive phototropism and negative phototropism? Give one example of each type.
Which of the following terms denotes the movement of the root of a plant towards moisture in the soil?
(a) thigmotropism
(b) chemotropism
(c) hydrotropism
(d) geotropism
The root of the plant is ______.
- positively phototropic but negatively geotropic
- positively geotropic but negatively phototropic
- negatively phototropic but positively hydrotropic
- negatively hydrotropic but positively phototropic
The solar tracking of sunflower in accordance with the path of sun is due to ______.
Heliotropism is a kind of ______.
Assertion (A): If the plant part moves in the direction of gravity, it is called positive geotropism.
Reason (R): Stem shows positive geotropism.
Why do roots of halophytes show negative geotropism?
