When Levels of CO₂ Are Experimentally Increased in a Typical

question 64

Multiple Choice

When levels of CO₂ are experimentally increased in a typical grassland community, C₃ plants generally respond with a greater increase in productivity than C₄ plants. This is because

• A) C₃ plants are more efficient in their use of CO₂.
• B) C₃ plants are able to obtain the same amount of CO₂ by keeping their stomata open for shorter periods of time.
• C) C₄ plants don't use CO₂ as their source of carbon.
• D) C₃ plants are more limited by CO₂ availability because they lack mechanisms to prevent transpirational water loss.
• E) C₃ plants have special adaptations for CO₂ uptake, such as larger stomata.

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