Q.'Pyramid of biomass is always inverted in shape' - State your explanation.

Biomass pyramids are inverted in pond/aquatic ecosystems (small, fast-turnover producers support a larger consumer biomass) but upright in most terrestrial ecosystems -- so the pyramid of biomass is not literally always inverted, unlike the pyramid of energy, which is always upright.

A pyramid of biomass shows the standing crop (total dry weight) of organisms present at each trophic level at a given point in time. Whether this pyramid is upright or inverted depends on the ecosystem:

1. Terrestrial ecosystems (e.g. forest, grassland): producers (trees, grasses) are large, long-lived organisms that accumulate a very large standing biomass, decreasing at successive trophic levels -- giving the normal, upright pyramid shape.

2. Pond/aquatic ecosystems: the producers are microscopic phytoplankton (algae), which are extremely small individually and have very short lifespans, but reproduce and are consumed very rapidly (high turnover rate). At any single moment, their standing biomass is therefore small, even though their rate of production (productivity) over time may be high. The primary consumers (zooplankton) and the fish that feed on them are larger-bodied and longer-lived, so they accumulate a greater standing biomass than the producers supporting them at that instant. This makes the biomass pyramid of a pond ecosystem inverted (small producer biomass at the base, larger consumer biomass above).

   …