The primary (main) source of energy for all ecosystems on Earth is ....... .

Which one of the following is a correct food chain?

Which of the following in an ecosystem exhibits one-way flow rather than cyclic flow?

Which of the following is the primary source of energy for all ecosystems except deep-sea hydrothermal ecosystems?

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 $\%$)?

In relation to energy transfer in an ecosystem, explain the statement: "$10 \; kg$ of deer's meat is equivalent to $1 \; kg$ of lion's flesh".