Q 9 is wrong option c is right answer A food chain has several trophic levels where each trophic level is dependent on the other for energy. This interdependence maintains a biological equilibrium in the ecosystem. The various levels are as followed- 1) Producers make their own food which is passed on to the next trophic level. Example-plants. 2) Primary Consumers- It depends on the producers. Example-rabbit. 3) Secondary consumers- It depends on the primary consumer for energy. Example- bear 4) Tertiary consumer-It depends on the secondary consumers for the food. Example- Eagle 5) Decomposers decompose the dead and decaying material into humus which enriches the soil. Example- bacteria.
