When the Stomata in a Leaf Close During the Day

question 17

Multiple Choice

When the stomata in a leaf close during the day, then

• A) carbon dioxide in the air spaces in the leaf decreases.
• B) oxygen in the air spaces in the leaf increases.
• C) C₃ plants carry on photorespiration, using O₂ and producing PGA and CO₂.
• D) all photosystems as well as photorespiration come to a halt.
• E) All choices but the halting of photosystems are correct.

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