Which of the following present in maximum percentage in living matter ?

Options

A. Carbon
B. Nitrogen
C. Oxygen
D. Potassium

Answer

To determine which element is present in the maximum percentage in living matter, we can analyze the composition of both the earth's crust and the human body.

### Step-by-Step Solution:

1. **Identify the Elements in Living Matter**: Common elements found in living organisms include oxygen, carbon, hydrogen, nitrogen, phosphorus, and sulfur.

2. **Analyze the Composition of the Human Body**:
- Oxygen (O): Approximately 65%
- Carbon (C): Approximately 18.5%
- Hydrogen (H): Approximately 9.5%
- Nitrogen (N): Approximately 3.3%
- Phosphorus (P): Approximately 1%
- Sulfur (S): Approximately 0.25%

3. **Compare with Earth’s Crust**:
- Oxygen (O): Approximately 46.6%
- Silicon (Si): Approximately 27.7%
- Aluminum (Al): Approximately 8.1%
- Iron (Fe): Approximately 5%
- Calcium (Ca): Approximately 3.6%
- Sodium (Na): Approximately 2.8%
- Potassium (K): Approximately 2.6%
- Magnesium (Mg): Approximately 2.1%

4. **Determine the Maximum Percentage**:
- In the human body, oxygen is the most abundant element at 65%.
- In the earth's crust, oxygen is also the most abundant element at 46.6%.

5. **Conclusion**: Since oxygen has the highest percentage in both the human body and the earth's crust, it is the element present in maximum percentage in living matter.

### Final Answer:
**Oxygen (O)** is present in maximum percentage in living matter.