Question

Which ecological pyramid can never be inverted?

• A. Biomass pyramid
• B. Numbers pyramid
• C. Energy pyramid
• D. Productivity pyramid

Hint:

Ecological pyramids: \[ \boxed{ \begin{aligned} \text{Energy pyramid} &\rightarrow \text{Always upright} \text{Biomass pyramid} &\rightarrow \text{May be inverted} \text{Numbers pyramid} &\rightarrow \text{May be inverted} \end{aligned} } \]

Answer 1

The Correct Option is C

According to the second law of thermodynamics, energy decreases at every successive trophic level due to heat loss. Therefore, the energy available always decreases from producers to top consumers. Hence, the energy pyramid is always upright and can never be inverted. Thus, \[ \boxed{\text{Energy pyramid}} \] is the correct answer. Therefore, \[ \boxed{(C)} \]