IB ESS Unit 2: Ecosystems & Ecology (id: dd79b9e06)

本题目来源于试卷: IB ESS Unit 2: Ecosystems & Ecology，类别为 IB环境系统与社会

[单选题]
An experiment was carried owdh5 q17tyl 1f3x udph)ib;o9af8jt (ut using bottles with an Elodea plant in water. One was kept in light and the other in darkness. The dissolved oxygen values were obtained at the beginning of a op3x9thj )8b(;fiud the experiment and after two days in both bottles.


What is GPP ;NPP and R?

A. 800 ; 400 ; 400
B. 600 ; 200 ; 400
C. 600 ;400 ; 200
D. 800 ;200 ; 200


参考答案:  B


本题详细解析:
GPP = bottle in light (oxygen valuea hp:9gei 9fmr-oava1+ z6 .lf) – bottle in the dark
GPP = 800 -200
= 600
Respiration = initial value – bottle in the dark
= 600 – 200
= 400
NPP = GPP – R
= 600 – 400
= 200
The values represent oxygen released during photosynthesis causing an increase in value in the bottle kept in the light.
AND
In the dark, the plant carries out respiration so there is a decrease in value of oxygen.
Values for options A, C and D do not match the calculated values.

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