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Thigmotropism

The climbing ...

Question

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

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Solution

(c) thigmotropism

This is an example of thigmotropism.

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Similar questions

Q. P and Q are two types of plants having weak stems which cannot stand upright on their own. The plants P and Q have organs R and S respectively which can grow towards any support which they happen to touch and wind around that support. It is observed that organ R originates from the leaves of the plant whereas organ S originates directly from the stem of the plant.
(a) What is (i) R, and (ii) S?
(b) What is the name of growth movement exhibited by the organs R and S?
(c) Name the stimulus involved in this case.
(d) State whether the behaviour of organs R and S is a tropic movement or a nastic movement.
(e) Name one plant like P and another plant like Q.

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

What is the stimulus in :

(a) phototropism

(b) geotropism

(c) chemotropism

(d) hydrotropism

(e) thigmotropism

The movement of a shoot towards light is:

(a) geotropism

(b) hydrotropism

(c) chemotropism

(d) phototropism

Question 10
The movement of the shoot towards light is

(a) geotropism
(b) hydrotropism
(c) chemotropism
(d) phototropism

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