RQ in anaerobic respiration is

Options

A. 0.7
B. 0.9
C. unity
D. infinity

Explanation

### Step-by-Step Solution:

1. **Understanding Anaerobic Respiration**:
- Anaerobic respiration occurs in the absence of oxygen. It is a type of respiration that allows organisms to convert energy without the use of oxygen.

2. **Identifying the Process**:
- A common example of anaerobic respiration is fermentation. During fermentation, glucose is broken down into simpler compounds, such as ethanol and carbon dioxide.

3. **Chemical Reaction**:
- For instance, when pyruvic acid (the product of glycolysis) is converted into ethanol and carbon dioxide, the reaction can be represented as:
\[ \text{Pyruvic Acid} \rightarrow \text{Ethanol} + \text{CO}_2 \]

4. **Understanding RQ (Respiratory Quotient)**:
- The respiratory quotient (RQ) is a measure used to determine the ratio of carbon dioxide produced to oxygen consumed during respiration. It is calculated using the formula:
\[ RQ = \frac{\text{CO}_2 \text{ produced}}{\text{O}_2 \text{ consumed}} \]

5. **Calculating RQ in Anaerobic Respiration**:
- In anaerobic respiration, since oxygen is not used, the amount of oxygen consumed is zero. Therefore, the RQ can be expressed as:
\[ RQ = \frac{1 \text{ (CO}_2 \text{ produced)}}{0 \text{ (O}_2 \text{ consumed)}} \]
- This results in an undefined value, which is often referred to as infinity.

6. **Conclusion**:
- Thus, the RQ in anaerobic respiration is considered to be infinite.

### Final Answer:
The RQ in anaerobic respiration is infinity.

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