- Ecological efficiency describes the efficiency with which energy is transferred from one trophic level to the next.
- The number of trophic levels in the grazing food chain is restricted as the transfer of energy follows 10 percent law – only 10 percent of the energy is transferred to each trophic level from the lower trophic level.
- The decreases at each subsequent trophic level is due to two reasons:
- At each trophic, a part of the available energy is lost in respiration or used up in metabolism.
- A part of the energy is lost at each transformation.
