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Question
(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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Solution
SI No.
•Thigmotropism
•Thigmonasty
1
The directional movement of plant parts in response to touch is known as thigmotropism.
The non-directional movement of the plant parts in response to touch is known as thigmonasty.
2
For example, the winding movement of the tendril of a climbing plant.
For example, the folding up of the leaves of a sensitive plant (Mimosa pudica) on touching.
3
The winding movement of the tendril of a plant around a nearby object gives support to the plant having a weak stem showing positive thigmotropism.
The folding up of the leaves of a sensitive plant on touching is due to the sudden loss of water from pad-like swellings called ‘pulvini’ which is present in the base of the leaves.
•The Bitter gourd is the plant exhibiting Thigmotropism whereas Mimosa pudica is the plant exhibiting Thigmonasty.
| SI No. | •Thigmotropism | •Thigmonasty |
| 1 |
The directional movement of plant parts in response to touch is known as thigmotropism. |
The non-directional movement of the plant parts in response to touch is known as thigmonasty. |
| 2 |
For example, the winding movement of the tendril of a climbing plant. |
For example, the folding up of the leaves of a sensitive plant (Mimosa pudica) on touching. |
| 3 | The winding movement of the tendril of a plant around a nearby object gives support to the plant having a weak stem showing positive thigmotropism. | The folding up of the leaves of a sensitive plant on touching is due to the sudden loss of water from pad-like swellings called ‘pulvini’ which is present in the base of the leaves. |
•The Bitter gourd is the plant exhibiting Thigmotropism whereas Mimosa pudica is the plant exhibiting Thigmonasty.
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