What term is defined as the total mass of living matter in a given unit area?

• A. Biomass
• B. Trophic Level
• C. Pioneer Species
• D. Primary Succession

Answer: (A)

Biomass is the total mass of living matter in a given unit area. It captures the overall amount of living material present across all organisms and species in that space, typically expressed as dry mass per square meter. This differs from other terms: a trophic level is a position in the food chain, pioneer species are the first organisms to colonize a new or disturbed habitat, and primary succession is the gradual development of an ecosystem starting from bare substrate. So biomass directly answers the question by quantifying how much living material exists in a defined area.