The ultimate source of energy in the biosphere is

At which of the following levels is the energy the lowest?

Which of the following is a one-way cycle?

Organisms at a higher trophic level have less energy available. Comment.

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 primary function of a grazing food chain?