Energy in the Ecosystem Notes All the energy in an ecosystem comes from the _____! ______% of the sun’s energy that strikes the earth is absorbed by plants o Where does the rest go? Plants use that energy through ______________ to produce sugar (glucose) which can then be converted to the _______________ of the plant. Biomass – This is the mass of all ________ at any level in a food chain (the stuff!) The amount of biomass in a food chain creates a Pyramid of Biomass (diagram below). o Why? Approximately ______% of biomass at one level becomes biomass at the next level. The other ______% is uneaten, undigested (this energy is available to decomposers) or given off as heat from the activities of the organism. Biomass ______________ with each additional step upward in a food chain Energy is ______ as _______ (and cannot be reused) in each step of the food chain Pyramid of Numbers- pyramid showing that a large number of organisms (Primary Producers) is required at the base of the food chain (there are exceptions) to support a small number of organisms at the top. ***The number of organisms at the highest level in a food chain is directly related to the number of levels in the chain. How can more organisms be supported in an ecosystem? ***What is the difference between a pyramid of biomass and a pyramid of numbers?