Question

Trophic levels are formed by

• A. only plants
• B. only animals
• C. only carnivores
• D. organisms linked in food chain.

Answer 1

The correct option is D organisms linked in food chain.

Energy levels in an ecosystem are called trophic levels. The organisms deriving their energy from the same source belong to the same trophic level. Thus, the green plants, which may be phytoplanktos, herbs, shrubs or trees, which derive their energy from the sun and are called producers belong to first trophic or $T_1$ level.