試題詳解

11. Gross primary productivity is higher than net primary productivity. The difference between the two is
(A) The amount of energy producers burn when they metabolize.
(B) Typically the ratio between the biomass of producers and the biomass of consumers.
(C) An important measure of ecosystem productivity.
(D) Energy that is lost into outer space due to metabolic inefficiencies.
(E) EerBy that is stored in plant tissues.