What Would Be the Expected Effect on Plants If the Atmospheric

Multiple Choice

What would be the expected effect on plants if the atmospheric CO₂ concentration was doubled?

A) All plants would have faster growth rates.
B) C₃ plants would have faster growth rates; C₄ plants would be minimally affected.
C) C₄ plants would have faster growth rates; C₃ plants would be minimally affected.
D) C₃ plants would have faster growth rates; C₄ plants would have slower growth rates.