Pyramids of energy are-

Options

A. Always upright
B. Always Inverted
C. Mostly upright
D. Mostly inverted

Answer

### Step-by-Step Solution:

1. **Understanding Pyramids of Energy**:
- Pyramids of energy represent the flow of energy through different trophic levels in an ecosystem. Each level represents a different stage in the food chain, starting from producers (like plants) at the base to top predators at the apex.

2. **Energy Transfer Between Trophic Levels**:
- Energy is transferred from one trophic level to the next. However, during this transfer, energy is lost primarily in the form of heat due to metabolic processes. This means that not all the energy from one level is available to the next.

3. **The 10% Rule**:
- According to the 10% rule, only about 10% of the energy from one trophic level is passed on to the next level. The remaining 90% is lost to the environment, which reinforces the idea that energy decreases as you move up the trophic levels.

4. **Shape of the Pyramid**:
- Because energy decreases as you move up the trophic levels, the pyramid of energy is always upright. This means that the base (producers) has the highest amount of energy, and as you move up to herbivores and then to carnivores, the energy decreases.

5. **Conclusion**:
- Therefore, the correct answer to the question "Pyramids of energy are-" is that they are **always upright**.

### Final Answer:
Pyramids of energy are **always upright**.

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