At a minimum, primary producers require water, carbon dioxide, and light. These are things that are readily available in most ecosystems. However, we do not observe the same rates of net primary productivity in every region of the globe
Which of the following statements best
reflects one reason why rates of productivity are not the same everywhere?
A. Rates of net primary productivity are
actually the same everywhere; scientists just
need to calculate the rates relative to plant
biomass in a given ecosystem.
B. Although water is limited in certain
ecosystems, nutrients that are scarce actually
limit net primary productivity because they
are necessary for growth.
C. Although water is limited in certain
ecosystems, irrigation would solve the
problem and equalize rates of net primary
productivity in every ecosystem.
D. Rates of net primary productivity are
actually limited by the amount of solar
radiation. If net primary productivity were
calculated as a yearly average, then this
would show that ecosystems have the same
rate of productivity.
B
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