Select the incorrect statement from the following .

Options

A. During oxidation within a cell all the energy contained in respiratory substrate is released free into the cell.
B. Energy is released in a series of slow step wish reactions controlled by enzymes.
C. Energy is trapped as chemical energy in the form of ATP.
D. Energy released by oxidation, in respiration is not used directly.

Answer

To solve the question of selecting the incorrect statement from the given options, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Statement 1**: "During oxidation within a cell, all the energy contained in the respiratory substrate is released free into the cell."
- **Analysis**: This statement is incorrect. During cellular respiration, the energy from the respiratory substrates (like glucose) is not released all at once. Instead, it is released in a controlled manner through a series of enzymatic reactions. The energy is captured in the form of ATP, which is a usable form of energy for the cell.

2. **Statement 2**: "Energy is released in a series of slow steps with reactions controlled by enzymes."
- **Analysis**: This statement is correct. The process of oxidation in cellular respiration involves multiple steps, and each step is facilitated by specific enzymes. This ensures that energy is released gradually and efficiently.

3. **Statement 3**: "Energy is trapped as chemical energy in the form of ATP."
- **Analysis**: This statement is also correct. The energy released during the oxidation of substrates is indeed captured in the form of ATP, which serves as the primary energy currency of the cell.

4. **Statement 4**: "Energy released by oxidation in respiration is not used directly."
- **Analysis**: This statement is correct as well. The energy released during respiration is not used directly; instead, it is stored in ATP molecules, which are then used by the cell for various processes.

### Conclusion:
The incorrect statement among the given options is **Statement 1**.