試題詳解

15. What would be the expected effect on C3 and C4 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.