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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.
APPEARS IN
संबंधित प्रश्न
Name one example of the movement of a plant part which is very quick and can be observed easily.
What is the stimulus in phototropism?
One of the following plant hormones is responsible for the phenomenon of phototropism in plants. This is :
(a) gibberellin
(b) eltroxin
(c) cytokinin
(d) auxin
A growing seedling is kept in a dark room. A burning candle is placed near it for a few days. The top part of seedling bends towards the burning candle. This is an example of :
(a) chemotropism
(b) hydrotropism
(c) phototropism
(d) geotropism
The response of plants to gravity is known as geotropism. How are plant parts sensitive to gravity? Describe with the help of a diagram.
Name the part of plant which shows positive geotropism. Why?
When the leaves of a sensitive plant are touched with a finger, they fold up, and when the light fades at dusk the petals of a sunflower. These two plants show ______ and ______ movements.
Assertion (A): If the plant part moves in the direction of gravity, it is called positive geotropism.
Reason (R): Stem shows positive geotropism.
What is the other name for thigmonasty?
Name the stimulus which causes the following movement in plant:
phototropism
