当绿色植物缺磷时,光合作用明显受到阻碍,这是因为(   ) A.磷是

当绿色植物缺磷时,光合作用明显受到阻碍,这是因为(   )

A.磷是酶的重要组成成分

B.糖类运输到块根、块茎和种子中都需要磷

C.磷对维持叶绿体膜的结构和功能起着重要作用

D.磷是叶绿素的重要组成成分

答案

C


解析:

磷是磷脂(磷脂双分子层是生物膜的基本骨架)分子的重要组成元素,缺磷会影响叶绿体膜的结构和功能。光合作用的酶(蛋白质)和叶绿素几乎不含磷,糖类的合成、运输与钾有关,与磷无关。

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