题干

图甲为横放在地面上的植物的生长状况,图乙为植物生长素浓度对植物生长的影响曲线.下列分析正确的是(    )

A:图甲中a、b、c、d四点的生长素浓度大小为a>c、d>b

B:若图甲中a点的生长素浓度为1010mol/L,则c点所对应的浓度介于1010~108mol/L之间

C:若图甲中b点的生长素浓度与图乙中E点对应的浓度相同,则d点的生长素浓度在E~B对应的浓度区间

D:生长素在F~A对应浓度范围内促进生长,在A~D对应浓度范围内抑制生长

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C

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