Explanation:
An inverted pyramid is a pyramid that is narrower at the bottom and wider at the top. This is opposite to a regular pyramid, which is wider at the bottom and narrower at the top. In ecology, a pyramid is a graphical representation of the trophic levels in an ecosystem. It shows the relative number, biomass, or energy at each trophic level.

Pyramid of Biomass:
The pyramid of biomass represents the amount of living organic matter at each trophic level. It can be measured as the dry weight of organisms per unit area or volume. In a grassland system, the pyramid of biomass is upright, with producers (grass) at the bottom and top carnivores (lions) at the top. This is because the grass has a high biomass, and the lions have a low biomass. However, in an aquatic system, the pyramid of biomass can be inverted. This is because the producers (phytoplankton) have a low biomass, but they reproduce rapidly, leading to a high turnover rate. The consumers (zooplankton) that feed on phytoplankton have a higher biomass but reproduce slower, leading to a lower turnover rate. The result is an inverted pyramid of biomass, with the consumers having a higher biomass than the producers.

Pyramid of Number:
The pyramid of number represents the number of individuals at each trophic level. In a grassland system, the pyramid of number is upright, with the producers (grass) at the bottom and top carnivores (lions) at the top. This is because the grass supports a large number of herbivores (zebras, deer, etc.), which in turn support a smaller number of carnivores. However, in an aquatic system, the pyramid of number can also be inverted. This is because the producers (phytoplankton) are very small and reproduce rapidly, leading to a high number of individuals. The consumers (zooplankton), which are larger and reproduce slower, have a lower number of individuals. The result is an inverted pyramid of number, with the consumers having a lower number of individuals than the producers.