The zone at the edge of a lake or ocean which is alternatively exposed to air and immersed in water is called.

Options

A. pelagic zone
B. benthic zone
C. lentic zone
D. littoral zone

Answer

To solve the question regarding the zone at the edge of a lake or ocean that is alternatively exposed to air and immersed in water, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Key Terms**: The question mentions a specific zone at the edge of a lake or ocean that experiences both exposure to air and immersion in water.

2. **Understand the Zones**:
- **Littoral Zone**: This is the area along the shoreline of a lake or ocean that is periodically exposed to air and submerged in water. It is characterized by the presence of various organisms that can tolerate both conditions.
- **Pelagic Zone**: This zone refers to the open water area away from the shore, which is not directly affected by the shoreline.
- **Benthic Zone**: This zone is located at the bottom of the water body, where organisms live on or near the substrate.
- **Lentic Zone**: This term refers to standing water bodies, such as ponds and lakes, but does not specifically address the shoreline.

3. **Analyze the Options**: Based on the definitions:
- The **littoral zone** is the only zone that fits the description of being alternately exposed to air and submerged in water.
- The other zones (pelagic, benthic, and lentic) do not meet the criteria set by the question.

4. **Conclude the Answer**: Therefore, the correct answer to the question is the **littoral zone**.

### Final Answer:
The zone at the edge of a lake or ocean which is alternatively exposed to air and immersed in water is called the **littoral zone**.

---