Botany Chapter on Stomata
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Questions and Answers

What primarily drives the opening of stomata in plants?

  • Decreased carbon dioxide concentration in surrounding air
  • Increased water potential within guard cells (correct)
  • Increased temperature leading to evaporative loss
  • Higher levels of potassium ions in the leaf

    • How does water potential influence the closing of stomata?

  • Increased light conditions directly affect water potential
  • Decreased water potential leads to turgor loss in guard cells (correct)
  • High external humidity increases water potential temporarily
  • Lower water potential in guard cells causes them to swell

    • What happens to stomata when a plant experiences water stress?

  • Stomata will open during the night to absorb moisture
  • Stomata open to increase gas exchange
  • Stomata remain unaffected
  • Stomata close to conserve water (correct)

    • Which of the following is not a factor affecting water potential in plants?

    <p>Root growth direction</p> Signup and view all the answers

    The relationship between water potential and stomatal movement is primarily mediated by which process?

    <p>Changes in turgor pressure of guard cells</p> Signup and view all the answers

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