Why Is Photorespiration More Likely to Occur During Warm Weather

question 12

Multiple Choice

Why is photorespiration more likely to occur during warm weather?

• A) Plants require warm weather (at least 23°C) to drive photosynthesis.
• B) Plants are more likely to close their stomata in the nighttime than during the day.
• C) Plants are more likely to dehydrate in warm weather, forcing them to close the stomata to conserve water, thus preventing CO₂from entering the leaf.
• D) The rubisco enzyme is very temperature sensitive and becomes less efficient in warmer temperatures, allowing it to fix O₂instead of CO₂.
• E) Plants use up the water in their central vacuoles in warm weather, inhibiting the water-requiring light reactions; this in turn alters the activity of rubisco.

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