In Several Studies of Plant Responses to Elevated CO₂ Concentrations

question 17

Multiple Choice

In several studies of plant responses to elevated CO₂ concentrations in the atmosphere, scientists often found that the stimulation of growth gradually diminished because

• A)more photorespiration occurred.
• B)C₃ plants were replaced with C₄ plants.
• C)the soil did not contain sufficient nitrogen and other nutrients to support the enhanced growth.
• D)the plants could not store the extra biomass.

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