Which of the following organisms were not given any place in ecological pyramids ?

Options

A. Working at several trophic levels
B. Decomposers
C. Parasites
D. More than one option is correct.

Answer

**Step-by-Step Solution:**

1. **Understanding Ecological Pyramids**: Ecological pyramids represent the distribution of biomass, numbers, or energy among trophic levels in an ecosystem. They typically include producers at the base, followed by primary consumers, secondary consumers, and tertiary consumers.

2. **Identifying Trophic Levels**: In a typical food chain:
- **Producers** (e.g., green plants) are at the base.
- **Primary Consumers** (e.g., herbivores like cows and buffalo) are the first level above producers.
- **Secondary Consumers** (e.g., carnivores like jackals and hyenas) follow.
- **Tertiary Consumers** (e.g., apex predators like lions and tigers) are at the top.

3. **Role of Decomposers**: Decomposers, such as saprophytes, break down dead organic matter and recycle nutrients back into the ecosystem. However, they are not typically represented in the ecological pyramids as they do not fit into the linear food chain structure.

4. **Conclusion**: The organisms that are not given a place in ecological pyramids are decomposers (saprophytes). Other options like parasites may have roles in food webs but are not typically represented in the classic ecological pyramid structure.

5. **Final Answer**: The correct answer is decomposers.

---