Question

What is the tropic movement?explain tropic movements with suitable examples?

Answer 1

The directional growth movements of plants due to external stimuli are called tropic movement. It can be either towards the stimulus, or away from it. For example, in case of phototropic movement, shoots respond by bending towards light while roots respond by bending away from it.

Answer 2

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When the direction of response of plant organs bears a definite relation with either towards or away from the external stimulus, then the movement is called tropic movement.

Tropic Movements are non-directional paratonic growth movements of curvature in which the direction of movement is determined bye the direction of stimulus. Tropic movements generally occur in cylindrical organs like stems and roots. The important Tropic movements phototropism, geotropism, hydrotropism, thigmotropism and chemotropism.

For example:- Tilt a well watered potted plant horizontally. Keep watering the plant on alternate days. Observe after a week that apical part of the shoot has bent upwardly due to its negative geotropic nature. The apical part of the root has similarly bent downwardly due to its positive geotropic nature. Negative geotropic response of Suits are useful in standing up of lodged crop plants. Similarly, Seedling coming out of the seeds placed in different directions in the soil will pass their shoots upwardly out of soil while the roots will bend down wardly.

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