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Plant Growth and Development question

2015 · Q2
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Plant Growth and Development question

2015 · Q2

NEETBiologyPlant Growth and DevelopmentMCQ+4 / −1
What causes a green plant exposed to the light, on only one side, to bend towards the source of light as it grows?
  1. A
    Light stimulates plant cells on the lighted side to grow faster.
  2. B
    Auxin accumulates on the shaded side, stimulating greater cell elongation there.
  3. C
    Green plants need light to perform photosynthesis.
  4. D
    Green plants seek light because they are photoreopic.
View written solutionFree

Correct answer: B

Auxin stimulates cell elongation. It accumulates on shaded side which results in more elongation of cells towards shaded side of the plant. This causes bending of the plant towards source of light.

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