Stomatal Regulation Research Recap Quiz
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Questions and Answers

What is the general role of Abscisic acid (ABA) in plant growth?

  • Enhancing photosynthetic rate
  • Stimulating CO2 uptake
  • Promoting stomatal opening
  • Reducing water loss by closing stomata (correct)
  • Where is ABA synthesized in plants?

  • In the stomata
  • In the root and leaf vasculature (correct)
  • In the xylem vessels
  • In the chloroplasts
  • How do small molecules known as plant hormones act in plants?

  • By acting as signals to evoke responses in plants (correct)
  • By promoting excessive water uptake
  • By promoting wilting of leaves
  • By inhibiting root growth
  • What is one of the effects of ABA on stomata?

    <p>Reducing water loss by closing stomata</p> Signup and view all the answers

    In what plant organ is ABA involved in stimulating water uptake?

    <p>Roots</p> Signup and view all the answers

    Which of the following is NOT a role of ABA in plant growth?

    <p>Stimulating CO2 uptake</p> Signup and view all the answers

    What is the main physiological role of basal abscisic acid (ABA) mentioned in the text?

    <p>Affecting water homeostasis</p> Signup and view all the answers

    Based on the information in the text, what is the effect of ABA on the deposition of suberin layers in plants?

    <p>Promoting the deposition of suberin layers</p> Signup and view all the answers

    In the context of stomatal regulation, which hypothesis suggests that potassium transporters play a crucial role?

    <p>Stomatal Aperture Recap Hypothesis</p> Signup and view all the answers

    What is the Null Hypothesis in the experimental design discussed in the text?

    <p>There will be no difference between mutants and wild-type plants in stomatal responses</p> Signup and view all the answers

    What was the specific treatment given to peeled strips in the experimental design mentioned in the text?

    <p>Incubation in KCl, CaCl2, and MES-KOH</p> Signup and view all the answers

    What do statistically significant asterisks (*) indicate regarding stomatal responses in the experimental results?

    <p>Significant difference between mutant and wild-type plants' responses</p> Signup and view all the answers

    What is the main finding regarding transgenic Arabidopsis plants overexpressing H+-ATPase using the strong guard cell promoter GC1?

    <p>Enhanced light-induced stomatal opening, photosynthesis, and plant growth</p> Signup and view all the answers

    What was the percentage increase in the fresh and dry weights of rosette leaves in the first 25 days of growth in the transgenic plants compared to the wild type?

    <p>42–63%</p> Signup and view all the answers

    Which treatment resulted in the dry weights of total flowering stems of 45-day-old transgenic plants being ∼36–41% greater than those of the wild type?

    <p>Overexpression of H+-ATPase in guard cells</p> Signup and view all the answers

    What is considered a limiting factor in photosynthesis and plant growth according to the results presented?

    <p>Stomatal aperture</p> Signup and view all the answers

    In response to red light, how is stomatal opening thought to be induced?

    <p>Via photosynthesis in guard cell chloroplasts</p> Signup and view all the answers

    Contrary to overexpression of H+-ATPase, what was the result when phototropin or inward-rectifying K+ channels were overexpressed in guard cells?

    <p>No effect on phenotypes related to stomatal opening, photosynthesis, and plant growth</p> Signup and view all the answers

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