Respiration differs from the process of combustion in the fact that

Options

A. All the energy stored in glucose is released at once
B. All the energy stored in glucose in gradually released
C. Comparatively large quantity of energy is produced
D. Only carbohydrates act as the combustion substance

Answer

To answer the question "Respiration differs from the process of combustion in the fact that," we need to analyze the two processes: respiration and combustion, and identify their differences.

### Step-by-Step Solution:

1. **Understanding Respiration:**
- Respiration is a biochemical process where organic molecules (like glucose) are broken down in the presence of oxygen to release energy.
- This process occurs in multiple steps and involves the production of adenosine triphosphate (ATP), which is the energy currency of the cell.
- The overall reaction can be summarized as:
\[ \text{Glucose} + \text{Oxygen} \rightarrow \text{Carbon Dioxide} + \text{Water} + \text{Energy (ATP)} \]

2. **Understanding Combustion:**
- Combustion is a chemical reaction where organic compounds (like hydrocarbons) react rapidly with oxygen to produce carbon dioxide, water, and a large amount of energy.
- This process occurs in a single, rapid step and releases energy all at once.
- The general reaction for combustion can be summarized as:
\[ \text{Organic Compound} + \text{Oxygen} \rightarrow \text{Carbon Dioxide} + \text{Water} + \text{Energy} \]

3. **Comparing Energy Release:**
- In respiration, energy is released gradually and stored in the form of ATP, allowing for controlled energy use by the cell.
- In combustion, energy is released all at once, which can be explosive and uncontrolled.

4. **Identifying the Key Difference:**
- The key difference lies in how energy is released: respiration releases energy gradually and in a controlled manner, while combustion releases energy in a large quantity all at once.

5. **Selecting the Correct Option:**
- Based on the analysis, the correct statement is that respiration differs from combustion in that respiration releases energy gradually, whereas combustion releases a comparatively large quantity of energy all at once.

### Final Answer:
Respiration differs from the process of combustion in the fact that respiration releases energy gradually, while combustion releases a comparatively large quantity of energy all at once.