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Phototropic curvature is result of unev...

Phototropic curvature is result of uneven distribution of

A

gibberellin

B

phytochrome

C

cytokinins

D

auxin

Text Solution

Verified by Experts

The correct Answer is:
D
Darwin and his son Francis used germinating oat (Avena sativa) and canary grass (Phalaris canariensis) seedling m their experiments and hypothesized that when shoots were illuminated from one side, they bent forward the light in response to an 'influence', that was transmitted downward from its source at the tip of the shoot. Paa] concluded that the tip secretes a substance which promotes the growth of part below it. In 1926, F Went discovered that some unidentified compound probably caused curvature of oat coleoptile towards light, i.e .. phototropism. The compound (auxin) found by Went is relatively abundant in coleoptile tips.
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Radius OF curvature

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NEET PREVIOUS YEAR (YEARWISE + CHAPTERWISE)-Plant Growth and Development -Exercise
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  9. Opening of floral buds is

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  10. The wavelength of light absorbed by Pr form of phytochrome is

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  11. The hormone which was discovered through ' foolish seedling ' disease ...

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  12. Which one of the following pairs , is not correctly matched

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