Self-Assessment 5.3

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Which of these environments would have facilitated the evolution of mechanisms to minimize photorespiration?

Cold environments with low CO₂ concentrations and low light levels correct incorrect

Hot environments with high CO₂ concentrations and low light levels correct incorrect

Hot environments with low CO₂ concentrations and high light levels correct incorrect

Cold environments with high CO₂ concentrations and high light levels correct incorrect

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How does C₄ photosynthesis lower photorespiration rates?

Increasing CO₂ concentrations where the Calvin cycle occurs correct incorrect

Decreasing O₂ concentrations in leaves by lowering respiration rates correct incorrect

Increasing O₂ concentrations in leaves by closing stomates correct incorrect

Using a more efficient form of rubisco that has low oxygenase activity correct incorrect

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Which of the following is an adaptation of photosynthesis to low water availability?

Photorespiration correct incorrect

CAM photosynthesis correct incorrect

C₃ photosynthesis correct incorrect

C₄ photosynthesis correct incorrect

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How is CAM photosynthesis different from C₃ photosynthesis?

CAM plants use a biochemical pump to increase CO₂ in the bundle sheath to minimize photorespiration. correct incorrect

CAM plants open stomates at night to lower water loss. correct incorrect

C₃ plants lack photorespiration. correct incorrect

C₃ plants minimize photorespiration by increasing CO₂ in the bundle sheath. correct incorrect