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.

Explanation

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. **Understand the Question**: The question asks for the specific zone at the edge of a lake or ocean that experiences both exposure to air and immersion in water.

2. **Identify the Options**: The options provided are:
- A) Pelagic zone
- B) Benthic zone
- C) Lentic zone
- D) Littoral zone

3. **Define Each Zone**:
- **Pelagic Zone**: This refers to the open water area away from the shore, not the edge.
- **Benthic Zone**: This is the bottom of the water body, where organisms live on or near the bottom, not the edge.
- **Lentic Zone**: This term generally refers to still water bodies like lakes, but does not specifically denote the edge.
- **Littoral Zone**: This is the area at the edge of a lake or ocean that is alternately exposed to air and submerged in water.

4. **Analyze the Correct Definition**: The littoral zone is characterized by its proximity to the shore and its alternation between being submerged and exposed, which matches the description given in the question.

5. **Choose the Correct Option**: Based on the definitions and analysis, the correct answer is:
- D) 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**.

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