Which part of pond ecosystem does not get affected by temperature?

Options

A. Epilimnion
B. Metalimnion
C. Hypolimnion
D. All

Answer

To answer the question "Which part of the pond ecosystem does not get affected by temperature?", we can break down the components of a pond ecosystem and their characteristics step by step.

### Step-by-Step Solution:

1. **Understanding the Layers of a Pond Ecosystem**:
- A pond ecosystem is typically divided into three main layers: the epilimnion (or apilimnion), the metalimnion (or thermocline), and the hypolimnion.

2. **Identifying the Epilimnion (Apilimnion)**:
- The epilimnion is the uppermost layer of the pond. It is warm due to direct exposure to sunlight and is where most of the biological activity occurs. This layer is affected by temperature changes because it exchanges heat with the atmosphere.

3. **Identifying the Metalimnion (Thermocline)**:
- The metalimnion is the middle layer and is characterized by a sharp temperature gradient. This layer experiences temperature changes as it separates the warm water above from the colder water below. Therefore, it is also affected by temperature.

4. **Identifying the Hypolimnion**:
- The hypolimnion is the bottom layer of the pond. It is typically colder and denser than the layers above it. This layer does not mix with the upper layers and is insulated from temperature changes because it does not exchange heat with the atmosphere.

5. **Conclusion**:
- Based on the characteristics of these layers, the hypolimnion is the part of the pond ecosystem that does not get affected by temperature changes. It remains insulated and maintains a stable temperature compared to the other layers.

### Final Answer:
The part of the pond ecosystem that does not get affected by temperature is the **hypolimnion**.

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