The rate at which energy is used to make new organic molecules in heterotrophs is known as : gross primary production.
Productivity is the rate of biomass production. Grams per year or kcal per square metre per year are used to express it. Gross primary productivity (GPP) and net primary productivity can be used to compare the productivity of various ecosystems (NPP).The rate at which organic matter is produced during photosynthesis, or the rate at which light energy is transformed into chemical energy, is the gross primary productivity of an ecosystem. Plants use a significant amount of GPP during respiration.
Net primary productivity is calculated as gross primary productivity less respiration losses (NPP).
An organism is referred to be a heterotroph if it is unable to manufacture food on its own and must obtain it from other sources of organic carbon, primarily plant or animal materials. Heterotrophs are primary, secondary, and tertiary consumers in the food chain but not producers.
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