When Levels of CO2 Are Experimentally Increased, C3 Plants Generally

question 57

Multiple Choice

When levels of CO2 are experimentally increased, 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 than C4 plants by CO2 availability because of transpirational water loss.
• E)C3 plants have special adaptations for CO2 uptake, such as larger stomata.

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