When levels of CO 2 are experimentally increased, C 3 plants generally respond with a greater increase in productivity than C 4 plants. This is because

C3 plants are more limited by CO2 availability due to their higher rates of photorespiration, which is reduced when CO2 levels are increased, leading to greater productivity gains compared to C4 plants.

When levels of CO 2 are experimentally increased, C 3 plants generally respond with a greater increase in productivity than C 4 plants. This is because

C3 plants are more limited by CO2 availability due to their higher rates of photorespiration, which is reduced when CO2 levels are increased, leading to greater productivity gains compared to C4 plants.

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When Levels of CO₂are Experimentally Increased, C₃plants Generally

Question 22

Multiple Choice

When levels of CO₂are experimentally increased, C₃plants generally respond with a greater increase in productivity than C₄plants. This is because

A) C₃plants are more efficient in their use of CO₂.
B) C₃plants are able to obtain the same amount of CO ₂by keeping their stomata open for shorter periods of time.
C) C₄plants dont use CO₂as their source of carbon.
D) C₃plants are more limited than C₄plants by CO₂availability because of transpirational water loss.
E) C₃plants have special adaptations for CO₂uptake, such as larger stomata.