Which of the following groups is absolutely essential functional component of the ecosystem?

Options

A. Producers
B. Producers and herbivores
C. Producers and detritivores
D. Detritivores

Answer

To determine which group is an absolutely essential functional component of the ecosystem, we need to analyze the options provided and understand the roles of different components within an ecosystem.

### Step-by-Step Solution:

1. **Understanding Ecosystem Components**:
- An ecosystem is composed of biotic (living) and abiotic (non-living) components.
- Biotic components include producers, consumers, and decomposers (detritivores).

2. **Identifying Producers**:
- Producers (like plants) are essential because they convert solar energy into chemical energy through photosynthesis, forming the base of the food chain.

3. **Understanding Detritivores**:
- Detritivores are organisms that feed on dead organic matter (waste and decaying plants and animals). They play a crucial role in nutrient cycling and decomposition.

4. **Evaluating the Options**:
- **Option A: Producer** - Essential for energy production.
- **Option B: Detritivore** - Important for decomposition and nutrient recycling.
- **Option C: Producer and Herbivore** - While producers are essential, herbivores (primary consumers) depend on producers and are not absolutely essential on their own.
- **Option D: Producer and Detritivore** - Both are essential; producers for energy and detritivores for decomposition.

5. **Conclusion**:
- The most comprehensive option that includes absolutely essential components is **Option D: Producer and Detritivore**. Both are critical for the functioning of an ecosystem.

### Final Answer:
**Option D: Producer and Detritivore** is the correct answer as both are absolutely essential functional components of the ecosystem.

---