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Question

Plant parts show two types of movements, one dependent on growth and other independent of growth. Give one example of the movement in plant parts :
(a) which depends on growth
(b) which does not depend on growth

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Solution

(a) Phototropism depends on growth. It is the growth of plant stem in response to sunlight.
(b) Thigmonasty does not depend on growth. It is a non directional movement of plant part, such as leaves, in response to touch.

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