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Photorespiration is favoured by

1. high O2 and low CO2
2. low light and high O2
3. low temperature and high O2
4. low O2 and high CO2

Correct answer: high O2 and low CO2

Solution

Photorespiration happens when RuBisCO binds O2 instead of CO2, which is more likely when oxygen is high and carbon dioxide is low. This shifts the enzyme toward its oxygenase activity, increasing photorespiration.

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