Phototropic curvature is the result of uneven distribution of

  • Option 1)

    Gibberellin

  • Option 2)

    Phytochrome

  • Option 3)

    Cytokinins

  • Option 4)

    auxin

 

Answers (1)

As we learnt in 

Auxin -

Tryptophan is the precursor of Indole acetic acid (IAA, natural auxin). Important biassay of auxins are Avena curvature test and cross root inhibition test.

 

- wherein

 

Discovered by Went.

 

Darwin used germinating oat (Avena sativa) and canary grass (phalaris canaries) seeding in his experiments and hypothesised that when shoots were illuminated from one side, they bent forward the light in response to an influence, that was the tip of the shoot. In 1926, Frits Went discovered that some unidentified compound probably caused curvature of oat coleoptile towards the light, i.e, phototropism. The compound (auxin) found by Went is relatively abundant in coleoptile tips.


Option 1)

Gibberellin

Incorrect Option

Option 2)

Phytochrome

Incorrect Option

Option 3)

Cytokinins

Incorrect Option

Option 4)

auxin

Correct Option

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