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Which of the following statements is not correct?
The pyramid of biomass in an open sea/aquatic ecosystem is characteristically INVERTED because the standing crop biomass of microscopic phytoplankton is vastly smaller than that of zooplankton and fishes! Claiming it is "generally upright" is false. Match Option (2)!
In marine and deep aquatic ecosystems, primary production is driven by microscopic unicellular algae and cyanobacteria (phytoplankton). Although their turnover rate and photosynthetic reproduction are rapid, their instantaneous standing crop biomass is minimal:
Because producer biomass at the base is markedly lower than consumer biomass at higher trophic levels, the ecological pyramid of biomass takes an inverted shape (spindle/upside-down triangle). Therefore, stating that the marine biomass pyramid is "generally upright" is factually incorrect.
- Energy Pyramid: Always strictly upright without exception, because energy is lost as heat at each trophic transfer in compliance with the Second Law of Thermodynamics. - Grassland Number Pyramid: Strictly upright because grasses outnumber herbivores, which outnumber carnivores.
Diagnose every choice: Know exactly why the right option works and why distractors fail.
This statement is TRUE. Phytoplankton standing biomass is smaller than the large biomass of predatory fishes, rendering the pyramid inverted.
This statement is FALSE (and hence the correct answer). Marine biomass pyramids are inverted, not upright.
This statement is TRUE. Energy flow between trophic levels is unidirectional and obeys Lindeman’s 10% law, so energy pyramids are invariably upright.
This statement is TRUE. Individual producers (grasses) vastly exceed the count of grazing herbivores and top predators.
Candidates remember that some pyramids are inverted but confuse tree ecosystem numbers (inverted) with marine biomass (inverted).
"The pyramid of biomass in sea is generally inverted because the biomass of fishes far exceeds that of phytoplankton."
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