R.Q. for glucose (carbohydrates) is

Options

A. 1
B. 0.5
C. 2
D. 0.05

Answer

To find the respiratory quotient (R.Q.) for glucose (a carbohydrate), we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Definition of R.Q.**:
The respiratory quotient (R.Q.) is defined as the ratio of the volume of carbon dioxide (CO2) produced to the volume of oxygen (O2) consumed during respiration. Mathematically, it can be expressed as:
\[ R.Q. = \frac{\text{Volume of CO2 evolved}}{\text{Volume of O2 consumed}} \]

2. **Write the Chemical Equation for Glucose Respiration**:
The respiration of glucose can be represented by the following balanced chemical equation:
\[ C_6H_{12}O_6 + 6 O_2 \rightarrow 6 CO_2 + 6 H_2O + \text{Energy} \]
This equation shows that one molecule of glucose reacts with six molecules of oxygen to produce six molecules of carbon dioxide and six molecules of water.

3. **Identify the Amount of CO2 and O2**:
From the equation, we can see that:
- 6 molecules of O2 are consumed.
- 6 molecules of CO2 are produced.

4. **Calculate the R.Q.**:
Using the values from the equation, we can substitute them into the R.Q. formula:
\[ R.Q. = \frac{6 \, \text{CO2}}{6 \, \text{O2}} = 1 \]

5. **Conclusion**:
Therefore, the respiratory quotient (R.Q.) for glucose is 1.

### Final Answer:
The R.Q. for glucose (carbohydrates) is **1**.

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