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

The driving force of an ecosystem is

Assertion: Ecosystems are not exempt from the second law of thermodynamics.
Reason: In a food chain,energy flow is bidirectional.

$10,000 \, J \rightarrow 1000 \, J \rightarrow 100 \, J \rightarrow 10 \, J$
Which of the following characteristics can be justified by linking the given information with various trophic levels?

The best source of energy in the environment is

Energy enters into the ecosystem through