Question

In an ecosystem, which ecological pyramid is always upright and never inverted?

• A. Pyramid of Biomass
• B. Pyramid of Numbers
• C. Pyramid of Energy
• D. Pyramid of Producers

Hint:

Remember: Pyramid of numbers and pyramid of biomass can sometimes be inverted in certain ecosystems, but the pyramid of energy is always upright due to continuous energy loss at each trophic level.

Answer 1

The Correct Option is C

Step 1: Understanding the Question:
Ecological pyramids represent trophic structures. Some can be inverted (e.g., biomass in aquatic systems), but one type is fundamentally constrained to be upright.
Step 2: Key Formula or Approach:
The 10% Law of Energy Transfer (Lindeman's Law) states that only about \(10%\) of the energy is transferred to the next higher trophic level.
Step 3: Detailed Explanation:
Energy enters the ecosystem via producers through photosynthesis.
As energy flows from producers to primary consumers, and then to secondary consumers, significant energy is lost as heat during respiration and metabolic processes.
Because energy cannot be recycled and is lost at every step, the total energy available at a higher level is always less than the level below it.
Therefore, the base (producers) is always broader than the apex.
Step 4: Final Answer:
The Pyramid of Energy is always upright because energy flow is unidirectional and dissipative.