将某绿色植物放在特定的实验装置中研究温度对光合作用和呼吸作用的影响(其他实验条件都是理想的)，实验以CO2的吸收量与释放量为指标，实验结果如下表所示
下列对该表数据分析正确的是（）。
- A.昼夜不停地光照，在35℃时该植物不能生长
- B.昼夜不停地光照，在20℃时该植物生长最快
- C.每天光照12h、20℃时该植物积累有机物最多
- D.每天光照12h、30℃时该植物积累有机物是10℃时的2倍
正确答案及解析
正确答案
解析
表中“光照下吸收CO2(mg／h)”代表的是净光合作用速率，“黑暗中释放CO2(mg／h)”代表的是呼吸作用速率。由表可知，在昼夜不停地光照条件下，只要净光合作用速率大于0，植物就可以正常生长，A错误。净光合作用速率越大，植物生长越快，故昼夜不停地光照，在25℃时该植物生长得最快，B错误。有机物积累量=光照下积累的有机物量一黑暗下消耗的有机物量，故每天光照12小时，黑暗12小时，在20℃时该植物的有机物积累量最大，C正确。每天光照12小时，30 0C时积累的有机物量是：(3．50-3．00)×12=6 mg，10℃时积累的有机的量是：(1．75-0．75)×12=12 mg，两者的比值为0．5，D错误。
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