Choose the correct answer from the alternatives given.
Which of the following plant hormones was studied in the 1880s by Charles and Francis Darwin in experiments on phototropism?

Abscisic acid

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Auxin

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Cytokinin

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Ethylene

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Solution

The correct option is B Auxin
Auxins were the first plant hormones discovered. Charles Darwin was among the first scientists to dabble in plant hormone research. In his book "The Power of Movement in Plants" presented in 1880, he first describes the effects of light on the movement of canary grass (Phalaris canariensis) coleoptiles.
So, the correct option is 'Auxin'.

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