At each stage of the trophic levels, how much energy is lost?

At each stage of the trophic levels, only 10% energy is transferred from one level to another.

Explanation:

In an ecosystem transfer of energy from one stage to another is very inefficient. From first stage to next stage only 10% energy is transferred to next trophic level. Rest 90% lost in environment.

This is known as  LINDEMAN's TEN PERCENT LAW. Given by Raymond lindeman.Only 10% energy from one trophic level to next trophic level is transferred. Rest is used in respiration, breakdown etc.

First stage of trophic level has the highest energy and the last trophic level has the lowest amount of energy.

step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.