Phototropism in Plants

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Questions and Answers

What is phototropism in plants?

  • The phenomenon where plants grow towards light. (correct)
  • The process of plants growing away from gravity.
  • The method by which plants lose water.
  • The reaction of plants to temperature changes.

Which hormone is responsible for stimulating cell elongation in phototropism?

  • Auxin (correct)
  • Gibberellin
  • Cytokinin
  • Ethylene

What causes a plant to bend towards light during phototropism?

  • Unequal distribution of roots in the soil.
  • The weight of the flowers causing lateral growth.
  • Higher temperatures on the light side.
  • Differential growth rates on the sides of the stem. (correct)

What role does light play in phototropism?

<p>It serves as a main stimulus directing plant growth. (C)</p> Signup and view all the answers

When can the stimulus for phototropism occur?

<p>It can occur under various conditions including seasonal changes. (A)</p> Signup and view all the answers

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Study Notes

Phototropism

  • Plants grow towards light, this is called phototropism
  • The plant hormone auxin is produced in the growing tip of the stem
  • Auxin stimulates cell elongation on the darker side of the stem
  • This causes the stem to bend towards the light
  • Plants use phototropism to maximise their exposure to sunlight for photosynthesis
  • Phototropism is a response to light stimuli
  • Light stimuli can be diurnal, seasonal, or disease related
  • Auxin plays a key role in phototropism
  • Plants use phototropism to maximize light capture for photosynthesis

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