Most of the `CO_(2)` is released during -

Options

A. Glycolysis
B. The Kreb's Cycle
C. Lactate fermentation
D. Oxidative phosphorylation

Answer

To determine when most of the CO2 is released during respiration in plants, we can analyze the different stages of cellular respiration:

### Step-by-Step Solution:

1. **Understanding Cellular Respiration**: Cellular respiration consists of several stages: glycolysis, the link reaction, the Krebs cycle (also known as the citric acid cycle), and oxidative phosphorylation.

2. **Glycolysis**: This process occurs in the cytoplasm and breaks down glucose into pyruvate. Importantly, no CO2 is released during glycolysis.

3. **Link Reaction**: This occurs in the mitochondria, where pyruvate is converted into acetyl-CoA. During this conversion, one molecule of CO2 is released.

4. **Krebs Cycle**: This cycle occurs in the mitochondrial matrix. For each acetyl-CoA that enters the cycle, two molecules of CO2 are released through decarboxylation reactions. Therefore, this stage is significant for CO2 production.

5. **Lactate Fermentation**: This process occurs in anaerobic conditions and converts pyruvate into lactic acid. No CO2 is produced in this process.

6. **Oxidative Phosphorylation**: This stage involves the electron transport chain and ATP synthesis. No CO2 is released during oxidative phosphorylation.

7. **Conclusion**: The majority of CO2 produced during respiration in plants occurs during the Krebs cycle, where two CO2 molecules are released for each turn of the cycle.

### Final Answer:
Most of the CO2 is released during the Krebs cycle.

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