MODEL PAPER 1 — Science STD 10 — Question

Biomass in a pond ecosystem
Explanation: The pyramid shown here is an inverted pyramid. Pyramid of energy can never be inverted. Number of producer (i.e., phytoplanktons) in a pond are always more than the consumers thus, pyramid of number in a pond cannot be inverted. In forest, biomass of producers (i.e., tree) is large, so pyramid of biomass in a forest is also upright. Pyramid of biomass for pond ecosystem is inverted as biomass of a trophic level depends on reproductive potential and longevity of its members.