The motion of plants in response to the sun’s direction, for example sunflowers.
Sunflowers move their flower heads as the sun travels across the sky.
Movement or growth in response to temperature, for instance the leaves of rhododendron plants fold up in cold weather.
Movement or growth in response to touch or contact, for instance the Venus fly trap.
Movement or growth in response to chemicals, for example a pollen tube growing towards the ovule of a flower.