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Thigmotropism

When the leav...

Question

When the leaves of a Mimosa pudica plant are touched with a finger, they fold up quickly. This is an example of :

(a) chemotropism

(b) thigmonasty

(c) photonasty

(d) thigmotropism

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Solution

(d) thigmotropism

The leaves of a Mimosa pudica plant show response to touch. This is an example of thigmotropism.

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Similar questions

Q. When the leaves of a Mimosa pudica plant are touched with a finger, they fold up quickly. This is an example of :
(a) chemotropism
(b) thigmonasty
(c) photonasty
(d) thigmotropism

Q. The leaves of mimosa pudica plant fold up quickly when touched with a hand. This is known as

Q. The leaves of Mimosa pudica fold up and droop when touched. This happens due to change in .

The climbing organs of plants like tendrils grow towards any support which they happen to touch and wind around the support. This is an example of :

(a) chemotropism

(b) nastic movement

(c) thigmotropism

(d) geotropism

Q. (a) What is meant by positive tropism and negative tropism? Explain with examples.
(b) Define thigmotropism. Give one example of thigmotropism.
(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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