Responses to Cold Stress in Plants

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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 (D)</p> Signup and view all the answers

How does phy B affect PIF4 in the light?

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

Why is using sterile technique important in preventing infection?

<p>To prevent contamination and ensure accurate results (B)</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 (D)</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 (C)</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 (B)</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 (C)</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 (C)</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 (A)</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 (A)</p> Signup and view all the answers

How do plants adapt to abiotic stress?

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

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

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

What does the SPAD unit measure?

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

How has domestication influenced plant responses to stress?

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

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