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Answer: 4. Pyramid of biomass in a sea

Key idea: A pyramid is inverted when producers weigh less than consumers at a given time.

In the sea, producers are tiny phytoplankton that multiply fast but are eaten quickly, so their standing biomass at any moment is smaller than that of the zooplankton and fish they feed. The pyramid of biomass in the sea is therefore inverted.

Pyramid of energy is always upright. Biomass in a forest and numbers in grassland are upright (numbers in a tree ecosystem can be inverted, but not in grassland).

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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