← Back to Test

Problem 7 - Entrance Test

In a food chain, if the biomass of producers is 10,000 units, the biomass of primary consumers is 1,000 units, and the biomass of secondary consumers is 100 units, the ecological efficiency of energy transfer from producers to primary consumers is approximately:

Correct: B

Ecological efficiency is calculated as the ratio of energy or biomass at one trophic level to the energy or biomass at the previous (lower) trophic level, expressed as a percentage. Here, energy transfer efficiency from producers to primary consumers = (Biomass of primary consumers / Biomass of producers) × 100 = (1000 / 10000) × 100 = 10%. This aligns with Lindeman's ten percent law, which states that only about 10% of energy is transferred from one trophic level to the next.