Tropism - A plant growth in response to a stimulus, Positive tropism - Occurs when the growth is towards the stimulus., Negative tropism - Occurs when the growth is away from the stimulus., Phototropism - Is the change in growth of a plant in response to light., Geotropism - Is the change in growth of a plant in response to gravity., Thigmotropism - Is the change in growth of a plant in response to contact., Stimulus - Change in the environment ,

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