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Plant Movements

Movement in plants may not be very pronounced, but it is brought about by definite external and internal stimuli. Movement which occur due to external stimuli are known as induced or paratonic movements and the movements which occur due to factors inherent inside the plant body itself are known as autonomic or spontaneous movements.

 

Classification of Plant Movements

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Plant movements are of two types.

i) Autonomic or Spontaneous Movements

ii) Paratonic or Induced Movements

Autonomic Movements

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These are of three kinds.

i) locomotion movements

ii) Growth and Curvature Movements

iii) Variation Movements

Paratonic Movements

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They involve movement of the complete cell or organelle, and is influenced by external stimuli.

These are:

Tactic movements

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These include phototactic, thermotactic and chemotactic movements.

Phototaxis

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is the movement brought about in response to light.

Thermotaxis

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is the movement shown in response to heat.

Chemotaxis

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is the movement brought about due to some chemical substances.

Tropic Movements

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These include phototropism, geotropism, chemotropism, hydrotropism and thigmotropism.

Nastic movements

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photonasty, thermonasty, nyctinasty, seismonasty and hyponasty.

Hydroscopic movements

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Seismonastic movements

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