Question

Pyramid of energy is always:

• A. Inverted
• B. Upright
• C. Spindle shaped
• D. Horizontal

Hint:

This is a standard exam fact: While number and biomass pyramids can be inverted, the energy pyramid is always upright.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
The Pyramid of Energy displays the total energy available at each trophic level over a given period of time.

Step 2: Detailed Explanation:
Energy flow in an ecosystem follows the $10\%$ Law of Lindeman.
This law states that when energy is transferred from one trophic level to the next, only about $10\%$ of that energy is stored as biomass.
The remaining $90\%$ is lost to the environment as heat through respiration and other metabolic processes.
Because energy cannot be recycled and is progressively lost at each step, the level below must always have more energy than the level above it.
Producers (T1) $>$ Primary Consumers (T2) $>$ Secondary Consumers (T3).
This strict decline ensures that the pyramid base is always the widest, making the shape always upright.

Step 3: Final Answer:
The thermodynamic loss of energy during transfer ensures that the pyramid of energy remains universally upright with no exceptions.