Under what condition, the upright pyramid of biomass becomes inverted:

Options

A. Grassland ecosystem
B. Terrestrial ecosyslem
C. Pond ecosystem
D. Tree ecosystem

Answer

### Step-by-Step Solution:

1. **Understanding the Pyramid of Biomass**:
- The pyramid of biomass represents the total mass of living matter at each trophic level in an ecosystem. Typically, it is upright, meaning that the biomass decreases as you move from producers (like plants) to primary consumers (herbivores) to secondary consumers (carnivores).

2. **Identifying the Condition for Inversion**:
- An inverted pyramid of biomass occurs when the biomass of primary producers (like phytoplankton in aquatic ecosystems) is less than that of the primary consumers (like small herbivorous fish).

3. **Analyzing the Pond or Lake Ecosystem**:
- In a pond or lake ecosystem, the biomass of phytoplankton is often lower than that of the herbivorous fish that feed on them. This is due to the rapid reproduction and growth rates of the fish compared to the slower growth of phytoplankton.

4. **Understanding the Trophic Levels**:
- In this ecosystem, the trophic levels can be illustrated as follows:
- **Producers**: Phytoplankton (lower biomass)
- **Primary Consumers**: Small herbivorous fish (higher biomass)
- **Secondary Consumers**: Larger carnivorous fish (even higher biomass)
- This results in an inverted pyramid shape where the biomass of consumers exceeds that of producers.

5. **Conclusion**:
- Therefore, the pyramid of biomass becomes inverted specifically in the pond or lake ecosystem due to the higher biomass of herbivorous fish compared to the phytoplankton.