Flow of energy through various trophic levels in an ecosystem is unidirectional and non cyclic. Explain.

The energy from the sun reaches the food chain through the primary roducers (plants). This energy is passed on through successive trophic levels in the food chain. The energy transfer in the food chain follows the 10 percent law where in only 10% of the energy is transferred from one trophic level to the next successively. So, the movement of energy is only in one direction from lower to higher trophic level.