Question

An ecological pyramid of biomass is a representation of the ecosystems
A.Tissue at each trophic level
B.Biologic material in relation to abiotic material
C.Energy flow through each trophic level
D.Populations in each food web

Answer 1

Hint: Ecological pyramid is the graphical representation of biomass/energy/numbers in the ecosystem. In the pyramids, producers are represented at the bottom level. Pyramids can be drawn in terrestrial, aquatic, or any ecosystem.

Complete answer:Ecological pyramids are the graphical representation of different ecological parameters with producers at the base and top carnivores at the apex. The quantity of each level is indicated by the length of the bar, the so-called bar diagram.
A pyramid of numbers is upright in a grassland and pond ecosystem and inverted in a tree dominated ecosystem.
The pyramid of biomass represents the living tissue/ mass at each trophic level. These are upright in the terrestrial ecosystem and inverted in the aquatic ecosystem. It is inverted in the aquatic ecosystem as it depends upon the reproductive potential and longevity of the individual. But if total biomass produced per unit time is calculated, it is always upright.
A pyramid of energy is always upright in different ecosystems and it is considered the most representative of the functional aspects of an ecosystem.
So, the correct answer is option A. Tissue at each trophic level.

Note: Limitations of ecological pyramids are-
1. They assume that food chains are simple, but simple food chains do not exist in nature. Food webs are present.
2. A single species may operate to two or more trophic levels. They have no method of accommodating such species.
3. They have no space for detritivores and decomposers.