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Question

What is the optimum temperature required for C3 plants?

A
3040C
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B
2025C
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C
Above 40C
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D
Above 25C
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Solution

The correct option is B 2025C
C3 plants are those which exhibit the C3 pathway and use the Calvin cycle in the dark reaction of photosynthesis. The optimum temperature required for C3 plants is 2025C. In C4 plants the optimum temperature range is 3040C. C4 plants respond to higher temperatures with enhanced photosynthesis due to the CO2 concentrating system that inhibits RuBisCO oxygenase activity while C3 plants have much lower temperature optimum. At low temperatures enzymes become inactive and reduce photosynthesis rate and very high temperatures cause denaturation of enzymes.

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