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How does photorespiration lower the efficiency of photosynthesis quizlet?Explain why photorespiration lowers photosynthetic output for plants. Photorespiration decreases photosynthetic output by adding oxygen, instead of carbon dioxide, to the Calvin cycle. As a result, no sugar is generated (no carbon is fixed), and O2 is used rather than generated.
What is photorespiration and why does it lower photosynthetic output for plants?Photorespiration is the oxygenation of RuBP by RUBISCO followed by photorespiratory glycolate metabolism. Competition between O2 and CO2 reduces the rate of carbon assimilation, energetic efficiency of photosynthesis, and may reduce the photosynthetic quotient (PQ = O2 produced/CO2 assimilated).
Why is photorespiration a problem for photosynthesis?Photorespiration is the process of taking in molecular oxygen (O2) and releasing carbon dioxide (CO2) from organic substances in response to light. Photorespiration is harmful to C3 plants because it reduces plant productivity, which is why it is also known as a wasteful process.
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