PHOTOSYNTHESIS
C 4 PHOTOSYNTHESIS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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P and Q
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Q and R
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P and R
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R only.
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Detailed explanation-1: -An increase in the concentration of carbon dioxide increases the rate of photosynthesis. CO2 elevation causes considerably higher root, stem and leaf weight in C3 and C4 plants. Hence as vegetative growth of both C3 and C4 plants increases.
Detailed explanation-2: -CO2 elevation caused considerably higher root, stem and leaf weight in C3 plants than in C4 plants. In intercropping condition, C4 plants shoot dry weights decreased under elevated CO2 concentration. It indicated that competitive ability of those plants reduced in these situations.
Detailed explanation-3: -The response of C3 species to increased [CO2] may be more positive than that of C4 species because photosynthetic rate of C3 species increases by approximately 58% due to doubled [CO2] (Drake et al. 1997). However, in C4 species, the photosynthesis is nearly saturated under recent ambient [CO2] (von Caemmerer et al.
Detailed explanation-4: -Carbon dioxide and rate of photosynthesis An increase in the carbon dioxide concentration increases the rate at which carbon is incorporated into carbohydrate in the light-independent reaction, and so the rate of photosynthesis generally increases until limited by another factor.