Auxin: The First Plant Hormone

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Questions and Answers

Who is credited with the discovery of auxin?

  • Charles Darwin (correct)
  • Louis Pasteur
  • Gregor Mendel
  • Marie Curie

What is the main role of auxin in plants?

  • Regulation of plant cell elongation (correct)
  • Protection against pests
  • Promotion of flowering
  • Enhancement of seed germination

What is the growth response of plants to unidirectional stimuli called?

  • Photosynthesis
  • Transpiration
  • Tropism (correct)
  • Respiration

Which plant part did Darwin and his son use in their experiments with coleoptiles?

<p>Canary grass seedlings (A)</p> Signup and view all the answers

What did Frits Went demonstrate in 1926 regarding auxin?

<p>Existence of a growth-promoting chemical (B)</p> Signup and view all the answers

Why did the coleoptile bend towards the light according to Darwin's experiment?

<p>Presence of a spreading substance (D)</p> Signup and view all the answers

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