Answer:
The
three examples of responses of plants to external stimulus are
(i)
Leaves of Mimosa pudica (Touch-me-not) fold when touched.
(1)
(ii)
Shape of plant cells changes by swelling/shrinking due to different
amounts of water. (1)
(iii)
Directional movement (tropism) is shown by plants in response to light, gravity
or chemical stimuli. (1)
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