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What is Tropism? A growth movement whose direction is determined by the direction from which the stimulus strikes the plant.
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Stimulus something that causes a change or a reaction .
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Positive response: Plants move toward the stimuli.
Ex: Growing towards the sun, roots growing down with gravity.
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Negative response: Plants move away from the stimuli.
Ex: Flowers growing up through the soil against gravity
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TYPES OF TROPISMS Phototropism
Geotropism
Hydrotropism
Thigmotropism
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Vocabulary Dissection
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PHOTOTROPISM Response to light
External Stimuli
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GEOTROPISM or GRAVITROPISM Response to gravity
External Stimuli
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THIGMOTROPISM Response to touch
External Stimuli
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Hydrotropism Plants respond to water.
External Stimuli.
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Summary What is a tropism?
A growth movement towards a stimulus. 4 Types of Tropisms
Phototropism-growth toward light.
Geotropism-growth due to gravity.
Hydrotropism-growth toward water.
Thigmotropism -growth due to touch.