WAEC - Biology (2018 - No. 32)
In an ecosystem, the least efficient energy transfer link is from the
secondary consumers to decomposers
sun to producers
primary consumers to secondary consumers
producer to primary consumers
Explication
From the food chain, the energy flows from the producers to the primary consumer to the secondary consumers and about 90% of the energy is lost in the process of this transfer. Hence, the energy level by the time it gets to the secondary consumers, there is less energy transferred to the decomposers.