TREE PHYSIOLOGY
PHOTOSYNTHESIS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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) have higher rates of photorespiration.
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cancontinue to fix CO2 even at relatively low CO2 concentrations and high oxygen concentrations.
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do not use rubisco for carbon fixation.
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grow better under cool, moist conditions.
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Detailed explanation-1: -We also found the increase of both biomass production and CO2 fixation with light intensity and CO2 concentration in C4 is faster than that in C3, which reflected more efficient use of light and CO2 in C4 plant.
Detailed explanation-2: -In C3 plants, the carbon dioxide fixation takes place only at one place. In C4 plants, the carbon dioxide fixation takes places twice (one in mesophyll cells, second in bundle sheath cells). C3 plants possess only one CO2 acceptor. C4 plants possess two CO2 acceptors (primary acceptor and secondary acceptor).
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.