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Phototropic and geotropic response toward the source of stimulus in shoot and root tips, respectively, is due to

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Cytokinins

Diberyllium

Abscisic and

Auxins

answer is A.

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Detailed Solution

Auxins promote positive phototropism in stem and positive geotropism in root. The auxin concentration that promote growth in stem inhibits growth in root. The auxin concentration that promotes growth in root shows no influence on growth in stem.

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