问题
选择题
小麦和玉米的CO2固定量随外界CO2浓度的变化而变化(如下图)。下列相关叙述不正确的是
A．小麦的CO2固定量与外界CO2浓度呈正相关
B．CO2浓度在100mg·L-1时小麦几乎不固定CO2
C．CO2浓度大于360mg·L-1后玉米不再固定CO2
D．C4植物比C3植物能更有效地利用低浓度CO2
答案
答案：C
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小麦和玉米的CO2固定量随外界CO2浓度的变化而变化(如下图)。下列相关叙述不正确的是
A．小麦的CO2固定量与外界CO2浓度呈正相关
B．CO2浓度在100mg·L-1时小麦几乎不固定CO2
C．CO2浓度大于360mg·L-1后玉米不再固定CO2
D．C4植物比C3植物能更有效地利用低浓度CO2
答案：C
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