During starvation, RQ value will be

Options

A. (a) zero
B. (b) less than unity
C. (c) more than unity
D. (d) unity

Answer

**Step-by-Step Solution:**

1. **Understand the Concept of RQ (Respiratory Quotient):**
- RQ is defined as the ratio of the volume of carbon dioxide produced to the volume of oxygen consumed during respiration. It is a dimensionless unit.
- RQ can be calculated using the formula:
\[ RQ = \frac{\text{Volume of CO}_2 \text{ produced}}{\text{Volume of O}_2 \text{ consumed}} \]

2. **Identify the RQ Values for Different Respiratory Substrates:**
- Carbohydrates: RQ = 1 (when fully metabolized)
- Proteins: RQ = 0.9 (when fully metabolized)
- Fats: RQ = 0.7 (when fully metabolized)

3. **Analyze the Condition of Starvation:**
- During starvation, the body lacks carbohydrates, which are the primary source of energy.
- In the absence of carbohydrates, the body resorts to using proteins and fats for energy.

4. **Determine the RQ Value During Starvation:**
- Since proteins and fats have RQ values of 0.9 and 0.7 respectively, the overall RQ during starvation will be less than 1.
- This is because the body is primarily utilizing these substrates, which yield lower RQ values compared to carbohydrates.

5. **Conclude the Answer:**
- Therefore, during starvation, the RQ value will be **less than unity**.

**Final Answer:**
- The RQ value during starvation will be **less than unity** (Option B).

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