Which is not recycled in ecosystem?

Options

A. Nitrogen
B. Water
C. Energy
D. Oxygen

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks which component is not recycled in the ecosystem. The options provided are Nitrogen, Water, Energy, and Oxygen.

2. **Identifying Recycled Elements**:
- Nitrogen, Oxygen, Sulfur, Phosphorus, and Carbon are essential elements that are recycled in the ecosystem through biogeochemical cycles.
- These cycles involve the movement of these elements from producers to consumers and then to decomposers, eventually returning to the environment.

3. **Considering Water**:
- Water is also recycled in the ecosystem through the water cycle. This includes processes like evaporation, condensation, and precipitation, which continuously recycle water.

4. **Analyzing Energy**:
- Unlike the other components, energy is not recycled in the ecosystem.
- When energy is transferred from one trophic level to another (e.g., from producers to primary consumers), a significant portion of it is lost, typically around 90%. Only about 10% of energy is passed on to the next level.

5. **Conclusion**:
- Since energy is not recycled and is lost at each trophic level, the correct answer to the question is **Energy**.

**Final Answer**: Energy is not recycled in the ecosystem.

---