In aquatic environment, microscopic animals and plants are collectively known as

Options

A. Commensals
B. Herbivores
C. Fauna and Flora
D. Planktons

Answer

To solve the question "In aquatic environment, microscopic animals and plants are collectively known as," we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question is asking for the collective term used to refer to microscopic animals and plants found in aquatic environments.

2. **Analyze the Options**: The options provided are:
- A) Commensals
- B) Herbivores
- C) Fauna and Flora
- D) Planktons

3. **Define Each Term**:
- **Commensals**: This term refers to organisms that live in a relationship where one benefits and the other is neither helped nor harmed. It does not specifically refer to aquatic microscopic organisms.
- **Herbivores**: These are animals that primarily consume plants. While they can be found in aquatic environments, they do not encompass both animals and plants.
- **Fauna and Flora**: Fauna refers to animals, and flora refers to plants. While this term includes both, it does not specifically refer to microscopic organisms.
- **Planktons**: This term specifically refers to microscopic organisms, including both plants (phytoplankton) and animals (zooplankton), that drift in aquatic environments.

4. **Identify the Correct Answer**: Based on the definitions, the term that best describes microscopic animals and plants in aquatic environments is **planktons**.

5. **Conclusion**: Therefore, the correct answer to the question is **D) Planktons**.