在环境中的CO2浓度恒定、温度适宜的情况下,测定植物叶片在不同光

在环境中的CO2浓度恒定、温度适宜的情况下,测定植物叶片在不同光照条件下CO2的吸收量,结果如表(表中负值表示CO2释放量,正值表示CO2吸收量):下列选项中正确的是    

光照强度(klx)

2.0

4.0

6.0

8.0

9.0

10.0

CO2吸收量(mg·100 cm2·h1)

2.0

2.0

6.0

10.0

12.0

12.0

A.光照强度在8.09. 0 klx之间时,细胞内合成ATP的速率不变

B.光照强度在2.0 klx时,细胞内不进行光合作用

C.光照强度在8.0 klx时,细胞既吸收CO2又吸收O2

D.超过9.0 klx时,光合速率不再增加,此时外界CO2浓度是其主要的环境制约因素

答案

D

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