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GK QUESTION#3937

In shoots showing positive phototropism, auxin brings about bending towards light by:

  1. APromoting equal growth on both sides
  2. BIncreasing elongation on the illuminated side
  3. CStopping growth on the darker side
  4. DEnhancing cell elongation on the shaded sideCorrect answer
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Answer

D. Enhancing cell elongation on the shaded side

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Explanation

In positively phototropic shoots, greater auxin action on the shaded side promotes greater cell elongation there, bending the shoot towards the light. Auxin responses depend on the organ and concentration.

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