An inverted pyramid of biomass is found in which ecosystem?

Aquatic ecosystem(sea).

The correct answer is Option (1) - Aquatic ecosystem(sea).

The pyramid of biomass in the sea is often inverted due to the higher biomass of fishes compared to phytoplankton. In sea is generally inverted because the biomass of fishes far exceeds that of phytoplankton. Phytoplankton, which are microscopic photosynthetic organisms, serve as the primary producers in marine ecosystems. They convert sunlight and nutrients into organic matter and form the base of the food chain.

The producers are smallest organisms while carnivores are large in size. Consequently , there is a gradual increase in biomass of organisms at successive trophic levels from producers onwards to top carnivores resulting in inverted pyramid. Thus, the biomass of phytoplanktons will be smaller than that of zooplanktons; the biomass of zooplanktons will be lesser than of primary carnivores ( e.g., small fishes) and the biomass of primary carnivores will be lesser than that of secondary carnivores (large fishes).