Which of the following statements is incorrect?

Options

A. A pyramid of energy can never be inverted.
B. Use of high temperature for waste disposal is called land filling.
C. Food chain shows unidirectional flow of energy and proceeds in a progressive straight line.
D. All of these

Answer

To determine which of the statements is incorrect, let's analyze each statement step by step:

1. **Statement 1**: "The pyramid of energy can never be inverted."
- The pyramid of energy represents the energy flow in an ecosystem, where energy decreases as it moves up the trophic levels. It is a fundamental principle that this pyramid cannot be inverted because energy is lost at each trophic level due to metabolic processes. Therefore, this statement is **correct**.

2. **Statement 2**: "Use of high temperature for waste disposal is land filling."
- This statement suggests that using high temperatures for waste disposal refers to land filling. However, high-temperature waste disposal typically refers to incineration, where waste is burned at high temperatures. Land filling, on the other hand, involves burying waste in the ground. Thus, this statement is **incorrect**.

3. **Statement 3**: "Food chain shows the flow of energy in a unidirectional manner."
- The food chain does indeed illustrate the flow of energy from producers to various levels of consumers in a one-way direction. Energy flows from one trophic level to the next without returning to the previous level. Therefore, this statement is **correct**.

4. **Conclusion**:
- Based on the analysis, the incorrect statement is **Statement 2**. The correct process for high-temperature waste disposal is incineration, not land filling.

### Final Answer:
The incorrect statement is **Statement 2**.