In an inverted pyramid of biomass commonly observed in marine aquatic ecosystems, which trophic level exhibits the smallest standing crop biomass?

Answer and explanation

Correct answer: D. Phytoplankton

  1. Step 1: The pyramid of biomass depicts the total dry mass of living organic material present across trophic levels at a given sampling time.
  2. Step 2: In open marine and pelagic ecosystems, the primary producers (phytoplankton) are unicellular organisms that reproduce rapidly and exhibit high turnover rates with short individual lifespans.
  3. Step 3: Consequently, a small instantaneous standing biomass of phytoplankton continuously supports a significantly larger, longer-lived biomass of herbivorous zooplankton and fish, forming an inverted pyramid of biomass.
Answer
Phytoplankton (primary producers).
Why not the others: Zooplankton (herbivorous consumers) maintain a substantially larger standing biomass sustained by the rapid turnover of primary producers; Small carnivore fish occupy an even higher biomass tier in the inverted marine profile; Apex marine predators (e.g., sharks) represent top trophic biomass supported by long food chains.

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