The discovery of auxin is traced back to the work of Charles and Francis Darwin on:
A
Photonastic movement
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B
Photoperiodism
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C
Phototropism
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D
Geotropism
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Solution
The correct option is A Phototropism The work of Charles and Francis Darwin regarding phototropism led to trace back the discovery of Auxin. Plants show phototropism in response to light stimuli. Auxin plays a vital role in exhibiting phototropism in plants.