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【单选题】
某兴趣小组探究土壤湿度对植物净光合速率的影响。对照组正常浇水,实验组不浇水,结果如下图。下列分析正确的是 A .该实验的自变量是时间,因变量是土壤中的含水量 B . 2~4 天,实验组净光合速率下降是由叶绿素含量下降引起的 C . 2~8 天,实验组的植株中有机物积累量仍然在增加 D .第 8 天,与对照组相比,实验组的叶绿体中积累了大量的 C 3
A.
a
B.
b
C.
c
D.
d
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