Which of the following best describes the gross primary productivity (GPP) of an ecosystem?
The energy available to herbivores after producers have used some for respiration.
The rate at which producers (like plants) convert solar energy into chemical energy through photosynthesis.
The energy remaining after autotrophs have met their metabolic needs.
The total biomass of all organisms present in the ecosystem.
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Which of the following best explains why tropical rainforests have a high primary productivity?
They receive abundant sunlight and consistent rainfall, supporting year-round plant growth.
They have nutrient-rich soils that continuously replenish essential minerals for plant growth.
They are located in high-latitude regions where cooler temperatures reduce plant respiration.
They experience seasonal droughts that limit plant growth to specific times of the year.
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Researchers have calculated the gross primary productivity (GPP) of a salt marsh to be 22,235 kcal/m2/year. The salt marsh producers use 12,315 kcal/m2/year for respiration(R). Calculate the net primary productivity (NPP) of the ecosystem.
2.7 X 108 kcal/m2/year.
34,550 kcal/m2/year.
9920 kcal/m2/year.
1.8 kcal/m2/year.
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Which of the following describes a strategy aquatic plants have adapted to survive at greater depths?
They rely solely on red light, which is abundant at all depths.
They migrate to shallower waters during daylight hours to maximize red light absorption.
They have developed specialized pigments that absorb blue wavelengths of light, which penetrate deeper into the water.
They utilize bioluminescence to generate their own light for photosynthesis.
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Which of the following is an accurate description of the relationship between Net Primary Productivity (NPP) and Precipitation?
Precipitation is dependent on NPP.
There is an inverse relationship between NPP and precipitation.
An increase in precipitation causes an increase in NPP.
As precipitation increases, NPP increases.
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Which of the following conclusions can be drawn from the graphs?
NPP increases continuously with rising temperature and precipitation, with no upper limit.
NPP is solely determined by precipitation levels and remains unaffected by changes in temperature.
NPP decreases as temperature increases, regardless of the amount of precipitation.
NPP peaks at an optimal range of moderate temperatures and then increases with precipitation up to a threshold, after which additional water does not significantly boost productivity.
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A tundra ecosystem has a net primary productivity (NPP) of 150 g C/m²/yr. The producers use 100 g C/m²/yr for respiration (R). Which of the following is the gross primary productivity (GPP) of the ecosystem?
50 g C/m²/yr
150 g C/m²/yr
250 g C/m²/yr
350 g C/m²/yr
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Which of the following best explains why the open ocean has a relatively low net primary productivity (NPP) per unit area (measured in kcal/m²/year) despite contributing significantly to Earth's total NPP?
The ocean has limited nutrient availability in open water, which limits phytoplankton growth.
Sunlight penetrates to all depths of the ocean, reducing the need for photosynthesis.
The ocean contains very few autotrophic organisms compared to terrestrial ecosystems.
High salinity levels prevent primary producers from efficiently converting energy.
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