Plant Growth and DevelopmentHard
Question
Phototropic curvatute is the result of uneven distribution of
Options
A.gibberellin
B.phytochrome
C.cytokinins
D.auxin
Solution
Darwin and his son Francis used germinating oat (Avena sativa) and canary grass seedlig in their experiments hypothesized that when shoots were illiminated from one side, they bent forward the light in response to an ′influences′ that was transmitted downwards from its sources at the tip of shoot. Pall concluded that the tipsecretes a substance, which promotes the groth of part below it. In 1926 First Went discovered that some unidentified compound probably caused curvature of oat coleoptile towards light, ie, phototropism compound found by Went is relatively abundant in coleoptile tips.
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