Which of the following aspects is not a component of functional unit of ecosystem?

Answer: DSolution: Interaction of biotic and abiotic components result in a physical structure, that is characteristic of each type of ecosystem. Components of ecosystem function as one single unit. Four important functional aspects of the ecosystem are : (i) Productivity, (ii) Decomposition, (iii) Energy flow and (iv) Nutrient cycling. Ecological pyramids are graphical representation of number, biomass and energy flow in n ecosystem.