Tropism is the particular direction that the organism (plant) goes to get to its source.

GRAVITROPISM

• A plants response to gravity
• Positive - growing towards gravity
• Negative - growing away from gravity

CHEMOTROPISM

• Plants movement in response to chemicals
• Example: a plant growing with fertilizer

PHOTOTROPISM

• A plant's movement in response to light. A.K.A. The plant grows towards the light.

THERMOTROPISM

• A plants movement in response to temperature change.

HYDROTROPISM

• A plants movement in response to water
• We usually see this on river banks where erosion has removed parts of it

THIGMOTROPISM

• A plants movement in response to touch
• Vines growing - positive
• Touch-me-nots - negative
• Venus flytrap - positive

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