In respiration, the energy not captured by ATP is

Options

A. Transferred to organic compounds
B. Converted into heat
C. Liberated alongwith `CO_(2)`
D. Transferred to water.

Answer

To solve the question "In respiration, the energy not captured by ATP is:", we can follow these steps:

### Step 1: Understand the process of respiration
Respiration is a biochemical process that converts glucose and oxygen into energy, carbon dioxide, and water. During this process, energy is released and some of it is captured in the form of ATP (adenosine triphosphate).

### Step 2: Identify the total energy released
The breakdown of one mole of glucose releases approximately 686 kilocalories of energy. This is the total energy available from the complete oxidation of glucose.

### Step 3: Determine the energy captured by ATP
Out of the total energy released (686 kilocalories), only a portion is captured in the form of ATP. According to the information provided, about 266 kilocalories of energy is stored as ATP.

### Step 4: Calculate the energy not captured by ATP
To find the energy that is not captured by ATP, we subtract the energy stored in ATP from the total energy released:
- Total energy released = 686 kilocalories
- Energy captured by ATP = 266 kilocalories
- Energy not captured by ATP = 686 - 266 = 420 kilocalories

### Step 5: Identify the fate of the remaining energy
The remaining energy (420 kilocalories) is not stored in ATP. Instead, it is released in other forms. According to the information provided, this energy is converted into heat, which is a byproduct of respiration.

### Conclusion
Therefore, the energy not captured by ATP during respiration is **converted into heat**.

### Final Answer
The correct option is: **Converted into heat.**

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