External stimuli cause movements in plants. These are three types.
Leaves and petals of flowers respond to contact, light and temperature. They show movements. E.g. Flowers of oxalis and leaves of leguminous plants open in the morning and closed at night.
Plant body as a whole move from one place to another in response to external stimuli. E.g. Movement in Chlamydomonas.
parts of the plant respond to the stimulus of gravity, light, and water and show movements roots move towards pull of gravity downwards. Stem moves towards light.
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