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پاسخ : بررسی سوالات مرحله دوم المپیاد زیست شناسی- دوره 17 - بهار 1393
The quantum yield of photosynthetic carbon
fixation in a C3 plant and in a C4 plant as a function of leaf
temperature. In normal air, photorespiration increases with
temperature in C3 plants, and the energy cost of net CO2
fixation increases accordingly. This higher energy cost is
expressed in lower quantum yields at higher temperatures.
Because of the CO2 concentrating mechanisms of C4 plants,
photorespiration is low in these plants, and the quantum
yield does not show a temperature dependence. Note that
at lower temperatures the quantum yield of C3 plants is
higher than that of C4 plants, indicating that photosynthesis
in C3 plants is more efficient at lower temperatures
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The quantum yield of photosynthetic carbon
fixation in a C3 plant and in a C4 plant as a function of leaf
temperature. In normal air, photorespiration increases with
temperature in C3 plants, and the energy cost of net CO2
fixation increases accordingly. This higher energy cost is
expressed in lower quantum yields at higher temperatures.
Because of the CO2 concentrating mechanisms of C4 plants,
photorespiration is low in these plants, and the quantum
yield does not show a temperature dependence. Note that
at lower temperatures the quantum yield of C3 plants is
higher than that of C4 plants, indicating that photosynthesis
in C3 plants is more efficient at lower temperatures
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