Why Is Net Primary Production (NPP) a More Useful Measurement

question 47

Multiple Choice

Why is net primary production (NPP) a more useful measurement to an ecosystem ecologist than gross primary production (GPP) ?

• A) NPP can be expressed in energy/unit of area/unit of time.
• B) NPP can be expressed in terms of carbon fixed by photosynthesis for an entire ecosystem.
• C) NPP represents the stored chemical energy that will be available to consumers in the ecosystem.
• D) NPP is the same as the standing crop.
• E) NPP shows the rate at which the standing crop is utilized by consumers.

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Definitions:

Aggregate Expenditure

The total amount of spending in the economy that includes consumer spending, investment, government spending, and net exports.

Multiplier

An economic factor that quantifies the change in income levels resulting from a change in spending or investment.

Gross Domestic Product

The total value of all goods and services produced within a country over a specific time period, serving as a broad measure of economic activity.

Marginal Propensity

The fraction of an additional amount of income that is spent on consumption. This is a key factor in determining the impact of an income change on the economy.