如图表示某种植物的非绿色器官在不同氧气浓度下气体吸收量和释放量的变化,请根据曲线图回答:(1)外界

2025-03-16 18:18:06
推荐回答(1个)
回答(1):

(1)外界氧浓度在5%以下时,此时该器官不吸收氧气,但有CO2释放,因此呼吸作用方式是无氧呼吸.
(2)外界氧气浓度在5%-15%时,此时CO2释放量大于O2吸收量,因此呼吸作用方式是有氧呼吸和无氧呼吸.
(3)该器官的释放CO2与吸收O2的两条曲线在B点相交后重合为一条曲线,表明此时CO2释放量与氧气的吸收量相等,因此该器官的呼吸作用方式是有氧呼吸.
(4)当外界氧浓度为10%时,O2的吸收量相对值为0.4,则通过有氧呼吸释放的CO2的相对值也应为0.4,有氧呼吸分解1mol葡萄糖释放6molCO2,所以通过有氧呼吸消耗葡萄糖的相对值应为0.4÷6.无氧呼吸释放的CO2的相对值为0.6-0.4=0.2,按题意该非绿色组织无氧呼吸产物是酒精和CO2,分解1mol葡萄糖释放2molCO2,所以通过无氧呼吸消耗的葡萄糖的相对值为0.2÷2.此时,该器官无氧呼吸的CO2释放量的相对值相当于有氧呼吸的0.2÷0.4=
1
2
,无氧呼吸消耗葡萄糖的相对值约相当于有氧呼吸的(0.2÷2)÷(0.4÷6)=1.5倍.
故答案为:
(1)无氧呼吸                 此时不吸收氧气,但有CO2释放
(2)有氧呼吸和无氧呼吸        此时CO2释放量大于O2吸收量
(3)有氧呼吸                此时CO2释放量与氧气的吸收量相等
(4)
1
2
                      1.5倍

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