Responses to Cold Stress in Plants

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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?

Inhibits transcription (D) Signup and view all the answers

How does phy B affect PIF4 in the light?

Destabilizes PIF4 (A) Signup and view all the answers

Why is using sterile technique important in preventing infection?

To prevent contamination and ensure accurate results (B) Signup and view all the answers

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

Decrease in reactive oxygen species (ROS) levels (D) Signup and view all the answers

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

Hydrolyzing starch into smaller polysaccharides and maltose (C) Signup and view all the answers

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

GA promotes the breakdown of starch in the endosperm by inducing alpha-amylase expression (B) Signup and view all the answers

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

To convert the measured signal into a concentration value (C) Signup and view all the answers

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

Synthesis of heat shock proteins to denature enzymes (C) Signup and view all the answers

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

Regulating stem elongation in response to GA (A) Signup and view all the answers

What is the light compensation point in photosynthesis?

The point at which light balances photosynthetic CO2 consumption to respiratory CO2 production (A) Signup and view all the answers

How do plants adapt to abiotic stress?

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

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

Plant breeding for tolerance (A) Signup and view all the answers

What does the SPAD unit measure?

leaf chlorophyll concentrations (B) Signup and view all the answers

How has domestication influenced plant responses to stress?

Through altered membrane composition and plant architecture (A) Signup and view all the answers

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

Management practices like timing of planting/harvest (D) Signup and view all the answers