Which of the following statement about GFC is incorrect ?

Options

A. Sun is the source of energy
B. Begins with consumers
C. Major conduit for energy flow in aquatic ecosystems
D. Size of organisms commonly increase at higher trophic levles.

Answer

To determine which statement about the Grazing Food Chain (GFC) is incorrect, let's analyze the statements provided in the video transcript step by step.

### Step-by-Step Solution:

1. **Understanding GFC**: The Grazing Food Chain (GFC) starts with producers (like plants) that convert solar energy into chemical energy through photosynthesis.

**Hint**: Remember that producers are the foundation of any food chain.

2. **Energy Source**: The sun is the primary source of energy for the GFC. This statement is true as all food chains ultimately rely on solar energy.

**Hint**: Think about where most ecosystems get their energy from.

3. **Starting Point**: The GFC begins with producers, not consumers. This is a key characteristic of the GFC and is true.

**Hint**: Consider the role of producers in the food chain.

4. **Ending Point**: The GFC usually ends with secondary or tertiary consumers. This statement is also true.

**Hint**: Identify the different levels of consumers in a food chain.

5. **Comparison with DFC**: The Detritus Food Chain (DFC) starts with dead organic matter and detritivores. This contrasts with the GFC, which starts with living producers.

**Hint**: Remember the difference between living and dead organic matter in food chains.

6. **Energy Flow**: The statement that the GFC is the major source of energy transfer in aquatic ecosystems is true, while the DFC is more significant in terrestrial ecosystems.

**Hint**: Think about how different ecosystems utilize energy sources differently.

7. **Size of Organisms**: It is true that the size of organisms typically increases at higher trophic levels, with producers being smaller than primary consumers, and so on.

**Hint**: Consider the general trend of organism size in food chains.

8. **Identifying the Incorrect Statement**: The only false statement mentioned in the video is that the GFC begins with consumers. This is incorrect because it actually begins with producers.

**Hint**: Focus on the starting point of the GFC to find the incorrect statement.

### Conclusion:
The incorrect statement about the Grazing Food Chain (GFC) is that it begins with consumers. In reality, it starts with producers.