In the following food chain, if $\displaystyle 50$ J of energy was available to the hawk, how much energy would have been present at the first and third tropic levels? Justify your answer.

The energy at first trophic level will be $\displaystyle 5,00,000$ J. The energy at third trophic level will $\displaystyle 5000$ J. $\displaystyle 10$% can be taken as the average value for the amount of organic matter/energy that is present at each step and reaches the next level of consumers.