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Question
Given table shows the CO2 compensation point and optimum CO2 concentration for phtosynthesis for C3andC4 plants.
C3 Plants C4 Plants CO20 compensation point 25-100 ppm A Optimum CO2 concentration B 360 ppm
Select the correct values for A and B.
Given table shows the CO2 compensation point and optimum CO2 concentration for phtosynthesis for C3andC4 plants.
Select the correct values for A and B.
| C3 Plants | C4 Plants | |
| CO20 compensation point | 25-100 ppm | A |
| Optimum CO2 concentration | B | 360 ppm |
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Solution
The correct option is C A-0-10 ppm;B- 450ppm
CO2 compensation point or threshold value is that concentration of CO2 at which illuminated plant parts stop absorbing carbon dioxide from their environment, At this value, CO2 fixed in photosynthesis is equal to CO2 evolved in respiration and photorespiration. The value is 25-100 ppm in C3 plants and 0-10 ppm in C4 plants .The reason for low compensation value forC4 plants is the greater efficiency of CO2 fixation through PEP-carboxylase. The optimum CO2 concentration for C4 plants is 360 ppm and C3 plants, it is 450 ppm. So, the correct answer is 'A-0-10 ppm;B- 450ppm'.
CO2 compensation point or threshold value is that concentration of CO2 at which illuminated plant parts stop absorbing carbon dioxide from their environment, At this value, CO2 fixed in photosynthesis is equal to CO2 evolved in respiration and photorespiration. The value is 25-100 ppm in C3 plants and 0-10 ppm in C4 plants .The reason for low compensation value forC4 plants is the greater efficiency of CO2 fixation through PEP-carboxylase. The optimum CO2 concentration for C4 plants is 360 ppm and C3 plants, it is 450 ppm. So, the correct answer is 'A-0-10 ppm;B- 450ppm'.
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