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, let's analyze each statement one by one:

### Step 1: Analyze the First Statement
**Statement:** "Biosphere is a global ecosystem."

- **Explanation:** The biosphere indeed refers to the global sum of all ecosystems. It encompasses all living beings and their relationships with the elements of the lithosphere, atmosphere, and hydrosphere.
- **Conclusion:** This statement is **correct**.

**Hint:** Remember that the biosphere includes all ecosystems on Earth.

### Step 2: Analyze the Second Statement
**Statement:** "Transfer of energy in ecosystem is explained in terms of food web and nutrient cycle."

- **Explanation:** Energy transfer in ecosystems is indeed described through food webs and nutrient cycles. Producers (like plants) convert solar energy into chemical energy, which is then transferred to consumers and decomposers.
- **Conclusion:** This statement is **correct**.

**Hint:** Consider how energy flows from producers to consumers in a food web.

### Step 3: Analyze the Third Statement
**Statement:** "Ecosystem is the structural and functional unit of nature."

- **Explanation:** An ecosystem is primarily considered a functional unit of nature because it encompasses the interactions and relationships between organisms and their environment. While it has structural components (like biotic and abiotic factors), it is not solely defined by its structure.
- **Conclusion:** This statement is **incorrect** because it misrepresents the primary role of the ecosystem.

**Hint:** Think about the role of interactions and processes in defining an ecosystem.

### Step 4: Analyze the Fourth Statement
**Statement:** "Pond, lake, and wetlands are aquatic ecosystems."

- **Explanation:** This statement is accurate as ponds, lakes, and wetlands are indeed types of aquatic ecosystems characterized by the presence of water.
- **Conclusion:** This statement is **correct**.

**Hint:** Recall the definition of aquatic ecosystems and examples of them.

### Final Conclusion
After analyzing all statements, the incorrect statement is the third one: "Ecosystem is the structural and functional unit of nature." It is primarily a functional unit, not just structural.

**Final Answer:** The incorrect statement is the third one.