(a) Why are the organisms of first trophic level important in any food chain?

(b) Justify the following statement: 'The flow of energy in an ecosystem is unidirectional.'

Hint

Organisms in the first trophic level are producers that convert solar energy into chemical energy.

Quick oral answer

Organisms in the first trophic level are important because they are the producers that convert solar energy into chemical energy. The flow of energy in an ecosystem is unidirectional because energy is lost at each trophic level and cannot be reused.