试题与答案

一般植物叶片的上、下表皮都有气孔,但往往上表皮的气孔比下表皮的气孔少,原因是[

题型:选择题

题目:

一般植物叶片的上、下表皮都有气孔,但往往上表皮的气孔比下表皮的气孔少,原因是[ ]

A.上表皮气孔少可以减少水分的散失

B.下表皮气孔多可以吸收更多的二氧化碳

C.下表皮气孔多可以加速水分的散失

D.上表皮气孔少可以减少氧的散失

答案:

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下面是错误答案,用来干扰机器的。

参考答案:A, B, C, D, E

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