MCQ on Photorespiration (C2 Cycle)




Photorespiration is a process in plants where the enzyme RuBisCO oxygenates RuBP, leading to the release of CO₂ instead of its fixation. This occurs when oxygen levels are high, reducing photosynthetic efficiency and wasting energy, particularly under stress conditions like high temperatures. This is an MCQ on Photorespiration (C2 Cycle) in Plants.

1. 
What is the C2 cycle also known as?

2. 
Which enzyme initiates the C2 cycle by fixing oxygen instead of carbon dioxide?

3. 
In which organelle does the C2 cycle primarily take place?

4. 
What is the main substrate for RuBisCO during photorespiration?

5. 
What is the first stable product of the C2 cycle?

6. 
Which organelle is involved in the conversion of glycolate to glyoxylate in the C2 cycle?

7. 
What molecule is produced in the mitochondrion during the C2 cycle that is transported back to the peroxisome?

8. 
What is the final product of the C2 cycle that can re-enter the Calvin cycle?

9. 
How does photorespiration affect the efficiency of photosynthesis?

10. 
In which type of environment is photorespiration most likely to occur?

11. 
Which compound is directly released as a by-product during the C2 cycle in mitochondria?

12. 
What is the role of glycine decarboxylase in the C2 cycle?

13. 
Which of the following is NOT an intermediate in the C2 cycle?

14. 
How does RuBisCO's dual activity affect the C2 cycle?

15. 
Which process is closely associated with the C2 cycle?



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MCQ on Photorespiration




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