Find the incorrect statement.

Options

A. Biosphere is a global ecosystem.
B. Transfer of energy in ecosystem is explains in terms of food web and nutrient cycle.
C. Ecosystem is structural and not functional unit of nature.
D. Pond , lake and wetlands are aquatic ecosystem.

Answer

To solve the question of identifying the incorrect statement, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Analyze the First Statement**:
- **Statement**: "Biosphere is a global ecosystem."
- **Evaluation**: This statement is true. The biosphere encompasses all ecosystems on Earth, including land, water, and the atmosphere, and is indeed considered a global ecosystem.

2. **Analyze the Second Statement**:
- **Statement**: "Transfers of the energy in ecosystem is explained in terms of the food web and the nutrient cycle."
- **Evaluation**: This statement is also true. Energy transfer in ecosystems is typically described through food webs (which illustrate feeding relationships) and nutrient cycles (which show how nutrients move through the ecosystem).

3. **Analyze the Third Statement**:
- **Statement**: "Ecosystem is structure and not functional unit of nature."
- **Evaluation**: This statement is incorrect. An ecosystem is both a structural and functional unit of nature. It comprises living organisms (biotic factors) and their physical environment (abiotic factors), and it performs various functions such as energy flow and nutrient cycling.

4. **Analyze the Fourth Statement**:
- **Statement**: "Pond, lake, wetlands are the aquatic ecosystem."
- **Evaluation**: This statement is true. Ponds, lakes, and wetlands are indeed classified as aquatic ecosystems, as they are water-based environments that support various forms of life.

### Conclusion:
The incorrect statement among the options provided is the third statement: "Ecosystem is structure and not functional unit of nature."

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