Responses to Cold Stress in Plants
18 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the role of DELLA proteins in the GA signaling pathway?

  • Acting as negative regulators of GA signaling (correct)
  • Facilitating the binding of GA to the receptor GID1
  • Activating transcription of growth-promoting genes
  • Binding to PIF3 and PIF4 to promote stem elongation

    • How do PIF3 and PIF4 influence plant growth?

  • Inhibiting the transcription of growth-promoting genes
  • Inducing flowering and fruit development
  • Enhancing abiotic stress tolerance
  • Promoting stem elongation by activating growth-promoting genes (correct)

    • Which process does GA promote in relation to DELLA repressors?

  • Activation
  • Inhibition
  • Degradation (correct)
  • Stabilization

    • What is the function of Actinomycin D in plant biology?

    <p>Inhibits transcription</p> Signup and view all the answers

    How does phy B affect PIF4 in the light?

    <p>Destabilizes PIF4</p> Signup and view all the answers

    Why is using sterile technique important in preventing infection?

    <p>To prevent contamination and ensure accurate results</p> Signup and view all the answers

    Which of the following is NOT a plant response to cold stress?

    <p>Decrease in reactive oxygen species (ROS) levels</p> Signup and view all the answers

    What is the primary role of alpha-amylase in barley seeds?

    <p>Hydrolyzing starch into smaller polysaccharides and maltose</p> Signup and view all the answers

    How does gibberellic acid (GA) affect barley seed germination?

    <p>GA promotes the breakdown of starch in the endosperm by inducing alpha-amylase expression</p> Signup and view all the answers

    What is the primary function of a standard curve in estimating sample concentrations?

    <p>To convert the measured signal into a concentration value</p> Signup and view all the answers

    Which of the following is NOT a response of plants to cold stress?

    <p>Synthesis of heat shock proteins to denature enzymes</p> Signup and view all the answers

    What is the role of PIF4/5 in the gibberellic acid (GA) signaling pathway?

    <p>Regulating stem elongation in response to GA</p> Signup and view all the answers

    What is the light compensation point in photosynthesis?

    <p>The point at which light balances photosynthetic CO2 consumption to respiratory CO2 production</p> Signup and view all the answers

    How do plants adapt to abiotic stress?

    <p>Through altered membrane composition, stomatal closure, and metabolite synthesis</p> Signup and view all the answers

    What is a common strategy used to improve plant stress tolerance?

    <p>Plant breeding for tolerance</p> Signup and view all the answers

    What does the SPAD unit measure?

    <p>leaf chlorophyll concentrations</p> Signup and view all the answers

    How has domestication influenced plant responses to stress?

    <p>Through altered membrane composition and plant architecture</p> Signup and view all the answers

    Which of the following is a way to improve stress tolerance in plants?

    <p>Management practices like timing of planting/harvest</p> Signup and view all the answers

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser