CBSE 2025, Set 2

Question

Construct a pyramid of biomass starting with phytoplankton, label its three trophic levels. Is the pyramid upright or inverted? Justify your answer.

Edvaya · Accepted Answer

The correct answer is Subjective. **SOLUTION** The pyramid of biomass starting with phytoplankton in an aquatic ecosystem is an **inverted pyramid**. ![Inverted Pyramid of Biomass](https://www.edvaya.com/images/cbse/biology/2025/inverted-pyramid-biomass.webp) **Trophic Levels:** 1. Primary Producers (PP): Phytoplankton 2. Primary Consumers (PC): Zooplanktons 3. Secondary Consumers (SC): Fishes **Justification:** The pyramid is inverted because the total biomass of the fishes (Secondary Consumers) is significantly much more than that of the zooplanktons, which in turn is greater than the standing crop biomass of the phytoplankton at any given time.

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Biology > Human Welfare Biotech And Ecology > Ecosystem

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