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Hormone involved in phototropism is...

Hormone involved in phototropism is

A

IA A

B

gibberellin

C

kinetin

D

2,4-D

Text Solution

Verified by Experts

The correct Answer is:
A
Phototropic curvature is the result of uneven distribution of auxin. Darwin and Darwin observed that the coleoptiles of canary grass responded to unilateral illumination by growing towads the light source (phototropism). After a series of experiments, it was concluded that the tip of coleoptile contains auxin that caused the bending of the entire coleoptile in relation to the direction of light.
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NCERT FINGERTIPS-PLANT GROWTH AND DEVELOPMENT-Plant Growth And Development
  1. Which of the following is both a growth promoter as well as a growth ...

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  2. Functions of plant growth promoters and plant growth inhibitros are gi...

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  3. Hormone involved in phototropism is

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  4. Which plant hormone induces the phenomenon of photoropism in plants?

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  5. Avena curvature test is a bioassay for examining the activity of

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  6. Gibberellin was first extracted from

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  7. Which one is paired incorrectly?

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  8. Who isolated auxins from tips of coleoptiles of oat seedings?

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  9. High concentration of auxin is present in

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  10. Which of the following effects of auxins on plants is the basis for th...

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  11. Which of the following hormones is used in root formation on stem cutt...

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  12. Select the correct statements (s) regarding auxins.

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  13. Apical dominance is dicot plants is due to the presence of morein the ...

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  14. The term 'auxin precursor' refers to

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  15. Read the given statements and select the correct option. (i) Darwin ...

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  16. In the process of apical dominance, lateral buds are unable to grow in...

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  17. Decapitation i.e. removal of shoot tips in a plant usually results in

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  18. In tea plantations and hedge making, gardeners trim the plants regular...

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  19. Removal of auxin source demonstrates that leaf abscission is by auxin,...

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  20. The hormone responsible for apical dominance is

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