Ratio of `CO_2` produced in aerobic and anaerobic respiration is

Options

A. `3:1`
B. `2:1`
C. `4:1`
D. `1:1`

Answer

To determine the ratio of CO2 produced in aerobic and anaerobic respiration, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Aerobic Respiration**:
- Aerobic respiration occurs in the presence of oxygen.
- The overall equation for aerobic respiration of glucose (C6H12O6) is:
\[ C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O + 30 \text{ ATP} \]
- From this equation, we see that 6 molecules of CO2 are produced for every molecule of glucose.

2. **Understand Anaerobic Respiration**:
- Anaerobic respiration occurs in the absence of oxygen.
- In the case of alcoholic fermentation (a common form of anaerobic respiration), the breakdown of glucose can be summarized as:
\[ C_6H_{12}O_6 \rightarrow 2C_2H_5OH + 2CO_2 + 2 \text{ ATP} \]
- Here, 2 molecules of CO2 are produced for every molecule of glucose.

3. **Calculate the Ratio**:
- From aerobic respiration, we have 6 CO2 molecules.
- From anaerobic respiration, we have 2 CO2 molecules.
- The ratio of CO2 produced in aerobic to anaerobic respiration is:
\[ \text{Ratio} = \frac{6 \text{ CO}_2}{2 \text{ CO}_2} = 3:1 \]

4. **Conclusion**:
- Therefore, the ratio of CO2 produced in aerobic respiration to that produced in anaerobic respiration is **3:1**.

### Final Answer:
The ratio of CO2 produced in aerobic and anaerobic respiration is **3:1**.

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