Give an account of energy flow in an ecosystem .

Explanation

The ultimate source of entire energy used by living thing is sunlight . The radiant energy of sunlight is converted into the chemical energy of the bonds of organic substances prepared by the green plants by photosynthesis . So they are the producers .
When an animal (Primary consumer ) eats a plant , the organic substances of the plant are oxidised in the animal.s body to liberate energy . Some of the energy releassed in the animal dissipated as heat and only a part is used in buliding up animal tissues . When a second animal ( Secondary consumer ) eats the first , a further loss of energy as heat occurs as the scond animal oxidises the organic substances of the first .
When the organisms undergo death , the decomposers decompose the dead bodies and release chemical energy . So the energy flow is unidirectional i.e., from sunlight to plants and from plants to animals and then to decomposers .