In which of the following , R.Q will always be less than one ?

Options

A. Potato
B. Rice
C. Groundnut
D. More than one option is correct

Answer

To solve the question regarding which of the following options has a Respiratory Quotient (RQ) that is always less than one, we need to understand the concept of RQ and how it varies with different types of food.

### Step-by-Step Solution:

1. **Understand RQ**:
- RQ, or Respiratory Quotient, is defined as the ratio of carbon dioxide (CO2) produced to oxygen (O2) consumed during respiration.
- The formula is:
\[ RQ = \frac{\text{CO2 produced}}{\text{O2 consumed}} \]

2. **Identify RQ Values for Different Nutrients**:
- RQ values vary depending on the type of macronutrient being metabolized:
- **Carbohydrates**: RQ = 1 (since they produce equal amounts of CO2 and O2)
- **Fats**: RQ < 1 (typically around 0.7)
- **Proteins**: RQ < 1 (typically around 0.8)

3. **Evaluate the Given Options**:
- The question presents several food items. We need to determine the predominant macronutrient in each:
- **Potato**: Primarily carbohydrate → RQ = 1
- **Rice**: Primarily carbohydrate → RQ = 1
- **Groundnut**: Contains a significant amount of protein → RQ < 1 (approximately 0.8)

4. **Conclusion**:
- Among the options provided, groundnut is the only food item whose RQ is always less than 1, as it is primarily composed of protein.

### Final Answer:
The correct option is **Groundnut**.

---