”The energy flow in the ecosystem follows the second law of thermodynamics.” Explain. 

Explanation

According to second law of thermodynamics every activity involving energy transformation (According to first law energy can be transferred and transformed) is accompanied by dissipation of energy as heat and only a part of it is used in building up tissues in an organisms. 
This trapped energy as biomass is transferred to next trophic level. According to Lindman law only 10% of the stored energy is passed from one trophic level to successive trophic level.