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【简答题】
下图Ⅰ表示某类C 3 植物固定和还原CO 2 的过程，图Ⅱ表示的是A、B、C三类植物在夏季晴朗的一天中气孔的开放情况。请据图分析，回答下列问题： (1)图Ⅰ所示植物在固定CO 2 的过程中与C 4 植物的共同点是___________，但此类植物在叶片结构上与C 3 植物是相同的，区别于C 4 植物最明显的特征是________________。 (2)图Ⅰ植物夜晚吸收CO 2 ，却不能合成(CH 2 O)，其原因是__________。 (3)图Ⅰ所示植物属于图Ⅱ中的______类。这类植物气孔开闭的特点，对植物生活的意义是________。 (4)下面甲、分别表示B植物的合速率与光照强度、CO 2 浓度的关系。下列叙述正确的是____。 A．若土壤中Mg含量持续下降，会导致甲图中a点，b点右移 B．对A植物而言，图a点应向右移动 C．图若光照强度适当提高，则a点右移，b点右移 D．光合作用和呼吸作用的最适温度分别为25℃和30℃，甲图表示25℃时关系，现将温度提高到30℃，则a点右移，b点
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