Ncert Exercises & Solutions

Q.45 Flow of energy through various trophic levels in an ecosystem is
unidirectional and non-cyclic. Explain.

Ans. The flow of energy in an ecosystem is always unidirectional, i.e., energy flow in one way and id noncyclic, like

As the energy content is decreasing from Ist trophic level fo the next trophic level and so on, Thus the energy cannot pass in the reverse direction.