Read the given statements and select the incorrect one.

Options

A. A food chain involves nutritive interaction between the living organisms of an ecosystem.
B. Quantum of available energy in a food chain successively gets decreased at each trophic level as a result of waste of energy.
C. Shape of pyramid of number is upright in a parasitic food chain and inverted in a grassland ecosystem.
D. About 10% of available energy gets transferred from one trophic level to another.

Answer

To solve the question of identifying the incorrect statement among the provided options, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: We need to read the statements related to food chains and ecosystems and identify which one is incorrect.

2. **Evaluate Each Statement**:
- **Statement 1**: "Food chain involves nutritive interaction between living organisms and an ecosystem."
- This statement is correct. A food chain does indeed represent the flow of energy and nutrients between organisms and their environment.

- **Statement 2**: "Quantum of available energy in a food chain is successively decreased at each trophic level as a result of wastage of energy."
- This statement is also correct. Energy decreases as it moves up the trophic levels due to energy loss at each level, typically around 90% is lost as heat, movement, etc.

- **Statement 3**: "Shape of pyramid of number is upright in case of parasitic food chain and inverted in case of grassland ecosystem."
- This statement is incorrect. In a parasitic food chain, the pyramid of numbers is typically inverted (more parasites than hosts), while in a grassland ecosystem, the pyramid of numbers is upright (more producers than consumers).

- **Statement 4**: "Only 10% of available energy will be transferred from one trophic level to the other."
- This statement is correct. It is a well-known ecological principle that approximately 10% of energy is transferred from one trophic level to the next.

3. **Identify the Incorrect Statement**: After evaluating all the statements, we find that Statement 3 is incorrect.

4. **Conclusion**: The incorrect statement is Statement 3.

### Final Answer:
The incorrect statement is **Statement 3**.

---