Which ecological pyramid can occasionally appear inverted when the biomass of primary producers is exceptionally smaller than that of primary consumers at a given moment?

💡 Solution & Explanation

The pyramid of biomass in an open ocean ecosystem is frequently inverted because microscopic phytoplankton reproduce rapidly and sustain a much larger standing crop biomass of zooplankton consumers at any snapshot in time. Pyramids of energy are invariably upright because energy is lost as heat at each trophic level following the laws of thermodynamics. Grassland number pyramids are typically upright due to large numbers of grasses supporting fewer herbivores.