LIFE SCIENCE

Detailed explanation-1: -Organisms in food webs are grouped into categories called trophic levels. Roughly speaking, these levels are divided into producers (first trophic level), consumers, and decomposers (last trophic level). Producers make up the first trophic level.

Detailed explanation-2: -trophic level, step in a nutritive series, or food chain, of an ecosystem. The organisms of a chain are classified into these levels on the basis of their feeding behaviour.

Detailed explanation-3: -In an ecological pyramid, the various trophic levels are primary producers (at the base), consumers (primary, secondary, tertiary, etc.), and predators (apex).

Detailed explanation-4: -First Trophic Level: Autotrophs. Second Trophic Level: Primary Consumers. Third Trophic Level: Secondary Consumers. Fourth Trophic Level: Tertiary Consumers. Fifth Trophic Level: Quaternary Consumers.