Which one is an inverted pyramid ?

Options

A. pyramid of numbers in a grassland
B. pyramid of energy in pond ecosystem
C. pyramid of biomass in a grassland
D. pyramid of biomass in pond ecosystem

Answer

To determine which option represents an inverted pyramid, we need to understand the concept of pyramids in ecology, specifically the pyramid of biomass, pyramid of numbers, and pyramid of energy.

### Step-by-Step Solution:

1. **Understand the Types of Pyramids**:
- **Pyramid of Numbers**: Represents the number of individual organisms at each trophic level. It can be upright or inverted depending on the ecosystem.
- **Pyramid of Biomass**: Represents the total biomass (mass of living matter) at each trophic level. This can also be upright or inverted.
- **Pyramid of Energy**: Represents the flow of energy through each trophic level. This pyramid is always upright because energy decreases as you move up the trophic levels.

2. **Analyze the Options**:
- **Pyramid of Numbers in a Grassland**: Typically upright because there are usually more producers than consumers.
- **Pyramid of Energy in Pond Ecosystem**: Always upright as energy decreases from producers to top consumers.
- **Pyramid of Biomass in a Grassland**: Usually upright as the biomass of producers is greater than that of consumers.
- **Pyramid of Biomass in Pond Ecosystem**: This can be inverted because the biomass of primary producers (like phytoplankton) can be less than that of primary consumers (like zooplankton).

3. **Identify the Inverted Pyramid**:
- Based on the analysis, the **Pyramid of Biomass in the Pond Ecosystem** is the one that is inverted. This is because the biomass of the primary producers is less than that of the primary consumers, resulting in an inverted shape.

4. **Conclusion**:
- The answer to the question "Which one is an inverted pyramid?" is **Pyramid of Biomass in Pond Ecosystem**.