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Ecosystems and Energy Flow — BIOLOGY STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceBIOLOGYEcosystems and Energy Flow5 Marks
Question
How would you explain inverted pyramid of biomass in oceanic ecosystem?
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Answer

  1. Pyramid of biomass is inverted in an oceanic ecosystem because in oceans the biomass of fishes is much more than the biomass of phytoplanktons.
  2. The biomass of phytoplanktons which are the producers in the ocean is smaller than that of zooplanktons.
  3. Zooplankton are primary consumers in oceans. The biomass of zooplanktons is smaller than that of secondary consumers which are fish.
  4. This results in the inverted pyramid of biomass is an oceanic ecosystem.
  5. Also the life span of phytoplankton is very small, which are consumed almost as rapidly as they are formed.
  6. The phytoplankton have high reproductive potential by which they reproduce rapidly. All these facts make the pyramid inverted in case of oceanic ecosystem.

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