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Answer:
when the ecosystem has an abundant supply of sun and water (ex. coral reefs, rainforests)
Explanation:
Net primary productivity of an ecosystem is high when there is a large number of green plants and photosynthetic algae present along with an enormous amount of sunlight and water.
Net primary productivity may be defined as the amount of matter accumulated by a plant per unit area in a given time. It may also be characterized as the amount of energy that is available to primary consumers i.e. herbivores.
NPP is available for consumers and increases biomass. It may be represented as follows:
NPP = Gross primary productivity (GPP) - Respiration loss.
The highest net primary productivity in terrestrial ecosystems occurs in swamps, marshes, tropical rainforests, etc. While the lowest NPP occurs in desert areas.
Therefore, the Net primary productivity of an ecosystem is high when there is a large number of green plants and photosynthetic algae present along with an enormous amount of sunlight and water.
To learn more about Net Primary Productivity, refer to the link:
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