Which of the following ecosystems will be more productive in terms at: primary productivity? Justify your answer. A young forest, a natural Old forest, a shallow polluted lake, alpine meadow.

Explanation

Primary Productivity can ,be defind as the rate at which primary producers (Green plants) traps and store solar radiation in form of biomass. This is measured in term of weight (`g^(-2)`) and in term of ensigy (Kcal `m^(-2)`) per year in given time. 
. primary productivity varies from ecosystem to ecosystem and the ecosystem which possess more producer will be more productive in term of primary productivity. So young forest grow quicker than older. mature forest and are more productive in terms at productivity. The shallow polluted lake and alpins meadow will be less productive because of less number of producers and high amount of dead matter.