What is biomass?

What is biomass?

• A. Stored energy in sunlight.
• B. Stored energy in living tissue that can be passed to the next trophic level when eaten.
• C. The rate at which energy flows through an ecosystem.
• D. The total number of organisms in an area.

Answer: (B)

Biomass is the amount of living matter in a given area, representing the stored chemical energy in the tissues of organisms. This stored energy is what can be passed on to the next trophic level when organisms are eaten, though only a portion makes it through due to metabolic costs and heat loss. Biomass is often measured as dry mass per area (like grams per square meter) or as carbon content, and it reflects a stock—an amount stored at a given time—not a rate of energy flow. The other options describe energy input from sunlight, the rate at which energy moves through the ecosystem, or the number of organisms, none of which capture the stored tissue energy available for consumption.

Biomass is the amount of living matter in a given area, representing the stored chemical energy in the tissues of organisms. This stored energy is what can be passed on to the next trophic level when organisms are eaten, though only a portion makes it through due to metabolic costs and heat loss. Biomass is often measured as dry mass per area (like grams per square meter) or as carbon content, and it reflects a stock—an amount stored at a given time—not a rate of energy flow. The other options describe energy input from sunlight, the rate at which energy moves through the ecosystem, or the number of organisms, none of which capture the stored tissue energy available for consumption.