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Control and Coordination — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceControl and Coordination3 Marks
Question
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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Answer

Thigmotropism
Thimonasty
The directional growth movement of a plant touch of an object is called thigmotropism. Example: Tendrils.
The non-directional movement of a plant part in responce to the touch of an object is called thigmonasty. Example: Mimosapudica.
Tendrils grow towards a stimulus hence it is a directional movement which shows that it is a case of thigmotropism whereas, the folding of leaves in mimosa plant does not depend on the direction of stimulus (touch) which shows that it is an example of thigmonasty.

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