Which of the following statements regarding food chain is false?

Options

A. In an aquatic ecosystem, grazing food chain is the major Conduit for energy flow.
B. In terrestrial ecosystems, a large fraction of energy flows through detritus food chain.
C. The detritus food chain being with dead organic matter .
D. Primary consumers belong to the first trophic level.

Answer

To determine which statement regarding the food chain is false, we need to analyze each option based on our understanding of food chains.

### Step-by-Step Solution:

1. **Understanding Food Chains**:
- A food chain is a sequence that shows how energy and nutrients flow from one organism to another in an ecosystem. It typically starts with primary producers (plants) and moves up to herbivores (primary consumers) and then to carnivores (secondary and tertiary consumers).

2. **Types of Food Chains**:
- There are two main types of food chains:
- **Grazing Food Chain (GFC)**: This involves primary producers (like plants) being consumed by herbivores, which are then consumed by carnivores.
- **Detritus Food Chain (DFC)**: This starts with decomposers that break down dead organic matter, which is then consumed by detritivores and subsequently by higher-level consumers.

3. **Evaluating the Statements**:
- **Statement 1**: "In aquatic ecosystem the GFC is a major conduit of energy."
- This is true; GFC is significant in aquatic ecosystems.
- **Statement 2**: "In terrestrial ecosystem the large amount of energy flows through the detritus food chain."
- This is also true; DFC is important in terrestrial ecosystems.
- **Statement 3**: "Detritus food chain begins with the dead organic matter."
- This statement is true as DFC starts with decomposers acting on dead matter.
- **Statement 4**: "Primary consumers belong to the first trophic level."
- This statement is false. Primary consumers (herbivores) belong to the second trophic level (T2), while the first trophic level (T1) consists of primary producers (plants).

4. **Conclusion**:
- The false statement regarding food chains is **Statement 4**: "Primary consumers belong to the first trophic level."

### Final Answer:
The false statement regarding food chains is: **"Primary consumers belong to the first trophic level."**

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