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(B) The discovery of the first plant growth hormone originated from the experiments conducted by $Charles$ $Darwin$ and his son $Francis$ $Darwin$. Th

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Boysen-Jensen and Darwin

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(B) The discovery of the first plant growth hormone originated from the experiments conducted by $Charles$ $Darwin$ and his son $Francis$ $Darwin$. They observed that the coleoptile of canary grass ($Phalaris$ $canariensis$) exhibited phototropism (bending towards light) only when the tip was exposed to unilateral light.Later, $Peter$ $Boysen-Jensen$ demonstrated that this signal was a chemical substance that could diffuse through a gelatin block, which was eventually identified as $Auxin$.

Classical experiments on growth were performed by

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