Why Are C4 Plants Able to Photosynthesize with No Apparent

question 44

Multiple Choice

Why are C4 plants able to photosynthesize with no apparent photorespiration?

• A) They do not participate in the Calvin cycle.
• B) They keep their stomata open most of the time in hot, dry climates, which allows for water loss to prevent photorespiration.
• C) They keep their stomata closed most of the time in hot, dry climates, which conserves water and oxygen to inhibit photorespiration.
• D) They do not use rubisco to fix CO₂.
• E) They exclude oxygen from their tissues.