Energy for the detritus food chain comes from

Which of the following has maximum energy at trophic level in this food chain $Grass \rightarrow Rabbit \rightarrow Wolf \rightarrow Lion$?

Only a small amount of the energy stored in food is available to the next organism in a food chain because

The percentage of energy transferred to the higher trophic level in a food chain is ....... (in $\%$)

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

The $10\%$ law of flow of energy in an ecosystem was proposed by