tropism assignment Nicholas by Rebecca Nicholas

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tropism assignment Nicholas

Published on Nov 18, 2015

Tropism assignment

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PRESENTATION OUTLINE

Tropisms

Example By mrs. nicholas

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The definition of tropism is an orientation of an organism to an external stimulus, as light, especially by growth rather than by movement.

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TYPES OF EXTERNAL STIMULI

Positive (growing towards)
Negative (growing away from)
Stimuli = PLURAL
Stimulus = SINGULAR

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GRAVITROPISM

PLANTS RESPONDING TO THE GRAVITATIONAL FORCE ON EARTH. ROOTS GROW DOWN AND SHOOTS GROW UP.

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PHOTOTROPISM

PLANTS GROWING TOWARDS A LIGHT SOURCE (SUNLIGHT OR ARTIFICIAL)

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THIGMOTROPISM

PLANTS GROWING IN RESPONSE TO TOUCH

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CHEMOTROPISM

PLANT GROWTH IN RESPONSE TO THE PRESENCE OF CHEMICALS

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HYDROTROPISM

PLANT GROWTH IN RESPONSE TO WATER

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Thermotropism

Growing and responding to temperature change

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10.

Venus Fly Trap

Good example of positive thigmotropism

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11.

Create a Haiku Deck which explains the types of tropisms (6) we have reviewed

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Rebecca Nicholas

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