Describe energy flow in an ecosystem

Explanation

Each step or level of food chain forms a trophic level. Energy flow begins with producers in it.
The producers (green plants) are at the first trophic level. They absorb light energy and through photosynthesis convert it in chemical energy as a food.
The energy then moves up to higher level organisms like herbivores. After that when carnivores eat herbivores. energy is transfered to carnivores. Thus, the flow of energy takes place from producer organisms to various levels of consumers. So. entrance for solar energy in an ecosystem is green plant which form the source of energy for consumers. Chemical energy is helpful for the processes of living world
The flow of energy in an ecosystem is always unidirectional. The energy that is captured by green plants does not revert back to the sun and the energy which passes to the herbivores does not come back to the autotrophs.
As energy moves progressively through the various trophic levels it is no longer available to the previous level