Question:
The process that operates in a diametrically opposite direction to CO2 fixation leading to a loss of photosynthetically fixed CO2 is
The process that operates in a diametrically opposite direction to CO2 fixation leading to a loss of photosynthetically fixed CO2 is
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Photorespiration: Rubisco oxygenase activity.
Loss of CO2 and energy (costly process).
Occurs in C3 plants at high temperature and low CO2.
Loss of CO2 and energy (costly process).
Occurs in C3 plants at high temperature and low CO2.
Updated On: Sep 1, 2026
- Dark respiration
- Photorespiration
- Oxidative phosphorylation
- Decarboxylation
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Question:
This question tests knowledge of photorespiration.
Step 2: Detailed Explanation:
Photorespiration operates in the opposite direction to CO2 fixation.
It leads to the loss of photosynthetically fixed CO2.
It occurs when Rubisco fixes O2 instead of CO2.
Dark respiration (A): Mitochondrial respiration (not directly opposite to CO2 fixation).
Oxidative phosphorylation (C): ATP synthesis in mitochondria.
Decarboxylation (D): Removal of CO2 from organic acids.
Thus, photorespiration causes loss of fixed CO2.
Step 3: Final Answer:
Thus, photorespiration leads to loss of CO2, which corresponds to option (B).
[0.5cm]
This question tests knowledge of photorespiration.
Step 2: Detailed Explanation:
Photorespiration operates in the opposite direction to CO2 fixation.
It leads to the loss of photosynthetically fixed CO2.
It occurs when Rubisco fixes O2 instead of CO2.
Dark respiration (A): Mitochondrial respiration (not directly opposite to CO2 fixation).
Oxidative phosphorylation (C): ATP synthesis in mitochondria.
Decarboxylation (D): Removal of CO2 from organic acids.
Thus, photorespiration causes loss of fixed CO2.
Step 3: Final Answer:
Thus, photorespiration leads to loss of CO2, which corresponds to option (B).
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