Detritus food chain begins with.....

The transfer of energy from one trophic level to another occurs according to the second law of thermodynamics. What is the average efficiency of energy transfer from herbivores to carnivores (in $\%$)?

If $20 \ J$ of energy is trapped at the producer level,then how much energy will be available to the peacock as food in the following food chain (in $J$)?
Plant $\rightarrow$ Mice $\rightarrow$ Snake $\rightarrow$ Peacock

What is the fraction of assimilated energy used in respiration by herbivores (in $\%$)?

Plants capture $............ \%$ of photosynthetically active radiation $(PAR)$.

The number of trophic levels in a food chain is limited to $4$ or $5$ because