why plants respond to stimuli ?
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Plants produce hormones and respondto external stimuli, growing towards sources of water and light, which they need to survive. A tropism is a growth in response to a stimulus and an auxin is a plant hormone produced in the stem tips and roots, which controls the direction of growth.
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Plants are known to respond to a number of external stimuli like light,
gravity, touch, chemicals, etc. Plants respond to the external factors
with the help of receptors and hormones. The receptors help the plants
to sense the external stimulus and act accordingly. As a result of these
stimuli, various growth hormones are produced which result in the
movement or directed growth of the plant. For example: Auxins are one of
the major plant hormones which regulate the growth of a plant. They
control the growth of plant in response to light.
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