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Question

The stem bends upwardly and root downwardly under the influence of gravity because

A
Of nature of stem and root
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B
Stem is photonastic and root geonastic
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C
Stem is negatively geotropic and root positively geotropic
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D
Stem is negatively hydrotropic and root positively hydrotropic
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Solution

The correct option is C Stem is negatively geotropic and root positively geotropic
The movement of plant part in response to force of gravity is called as geotropism. The movement of plant part towards the gravity is called as positive geotropism. Roots show positive geotropic movement. The movement of plant part away from the gravity is called as negative geotropism. Stems show negative geotropic movement.
Thus, the correct answer is option C.

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