Primary Productivity - AP Environmental Science
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What is the significance of the compensation point in photosynthesis?
What is the significance of the compensation point in photosynthesis?
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Where photosynthesis equals respiration. Light intensity balances photosynthesis and respiration rates.
Where photosynthesis equals respiration. Light intensity balances photosynthesis and respiration rates.
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State the equation representing primary productivity in terms of biomass.
State the equation representing primary productivity in terms of biomass.
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Productivity = Biomass gain - Biomass loss. Net growth represents successful energy conversion to biomass.
Productivity = Biomass gain - Biomass loss. Net growth represents successful energy conversion to biomass.
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State the formula for calculating Gross Primary Productivity (GPP).
State the formula for calculating Gross Primary Productivity (GPP).
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GPP = NPP + R. Gross productivity equals net productivity plus respiration costs.
GPP = NPP + R. Gross productivity equals net productivity plus respiration costs.
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What is the primary source of energy for primary productivity?
What is the primary source of energy for primary productivity?
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Sunlight. Solar radiation provides energy for photosynthetic processes.
Sunlight. Solar radiation provides energy for photosynthetic processes.
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Which type of ecosystem typically exhibits the lowest primary productivity?
Which type of ecosystem typically exhibits the lowest primary productivity?
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Deserts. Limited water and extreme temperatures restrict plant growth.
Deserts. Limited water and extreme temperatures restrict plant growth.
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How does soil fertility impact primary productivity in terrestrial ecosystems?
How does soil fertility impact primary productivity in terrestrial ecosystems?
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Higher fertility enhances productivity. Rich soils provide essential nutrients for plant growth.
Higher fertility enhances productivity. Rich soils provide essential nutrients for plant growth.
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Which factor is a limiting factor for primary productivity in freshwater lakes?
Which factor is a limiting factor for primary productivity in freshwater lakes?
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Phosphorus. Essential nutrient often limiting algal growth in freshwater.
Phosphorus. Essential nutrient often limiting algal growth in freshwater.
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What is the typical method for estimating aquatic primary productivity?
What is the typical method for estimating aquatic primary productivity?
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Measuring oxygen production or carbon uptake. Direct measurement of photosynthetic gas exchange rates.
Measuring oxygen production or carbon uptake. Direct measurement of photosynthetic gas exchange rates.
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State the primary productivity formula in terms of energy.
State the primary productivity formula in terms of energy.
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Productivity = Energy captured - Energy respired. Net energy available after accounting for metabolic costs.
Productivity = Energy captured - Energy respired. Net energy available after accounting for metabolic costs.
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What limits primary productivity in deep ocean zones?
What limits primary productivity in deep ocean zones?
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Lack of sunlight. Light cannot penetrate to support photosynthesis at depth.
Lack of sunlight. Light cannot penetrate to support photosynthesis at depth.
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Define Gross Primary Productivity (GPP).
Define Gross Primary Productivity (GPP).
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Total amount of energy captured by producers. All energy captured before any metabolic costs are subtracted.
Total amount of energy captured by producers. All energy captured before any metabolic costs are subtracted.
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Which factors most directly affect primary productivity in aquatic ecosystems?
Which factors most directly affect primary productivity in aquatic ecosystems?
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Light availability and nutrient concentration. These factors control photosynthesis rates in water ecosystems.
Light availability and nutrient concentration. These factors control photosynthesis rates in water ecosystems.
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What is the significance of the compensation point in photosynthesis?
What is the significance of the compensation point in photosynthesis?
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Where photosynthesis equals respiration. Light intensity balances photosynthesis and respiration rates.
Where photosynthesis equals respiration. Light intensity balances photosynthesis and respiration rates.
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What is the role of producers in an ecosystem's energy flow?
What is the role of producers in an ecosystem's energy flow?
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Convert solar energy into chemical energy. Primary producers capture and store energy for ecosystem use.
Convert solar energy into chemical energy. Primary producers capture and store energy for ecosystem use.
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What is the unit commonly used for measuring primary productivity?
What is the unit commonly used for measuring primary productivity?
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gC/m²/yr (grams of carbon per square meter per year). Standard unit measures carbon fixed per area per time.
gC/m²/yr (grams of carbon per square meter per year). Standard unit measures carbon fixed per area per time.
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How is primary productivity measured in terrestrial ecosystems?
How is primary productivity measured in terrestrial ecosystems?
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By plant biomass accumulation. Growth represents successful energy conversion to organic matter.
By plant biomass accumulation. Growth represents successful energy conversion to organic matter.
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What is the effect of increased carbon dioxide on primary productivity?
What is the effect of increased carbon dioxide on primary productivity?
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Can increase productivity by enhancing photosynthesis. More $CO_2$ provides additional substrate for photosynthesis.
Can increase productivity by enhancing photosynthesis. More $CO_2$ provides additional substrate for photosynthesis.
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Define Net Primary Productivity (NPP).
Define Net Primary Productivity (NPP).
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Energy remaining after respiration by producers. Available energy after plants use some for their own metabolism.
Energy remaining after respiration by producers. Available energy after plants use some for their own metabolism.
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State the formula for calculating Gross Primary Productivity (GPP).
State the formula for calculating Gross Primary Productivity (GPP).
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GPP = NPP + R. Gross productivity equals net productivity plus respiration costs.
GPP = NPP + R. Gross productivity equals net productivity plus respiration costs.
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Why is primary productivity important for ecosystems?
Why is primary productivity important for ecosystems?
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Provides energy base for food webs. Producers form the foundation supporting all other trophic levels.
Provides energy base for food webs. Producers form the foundation supporting all other trophic levels.
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What does NPP stand for in the context of primary productivity?
What does NPP stand for in the context of primary productivity?
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Net Primary Productivity. Energy available to consumers after producer respiration losses.
Net Primary Productivity. Energy available to consumers after producer respiration losses.
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What is the definition of primary productivity?
What is the definition of primary productivity?
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Rate at which energy is converted by photosynthetic organisms. Energy conversion drives all food webs and ecosystem functions.
Rate at which energy is converted by photosynthetic organisms. Energy conversion drives all food webs and ecosystem functions.
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What is the relationship between biodiversity and primary productivity?
What is the relationship between biodiversity and primary productivity?
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Higher biodiversity can increase productivity. More species can utilize resources more efficiently.
Higher biodiversity can increase productivity. More species can utilize resources more efficiently.
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How does increased turbidity affect aquatic primary productivity?
How does increased turbidity affect aquatic primary productivity?
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Reduces light penetration, decreasing productivity. Cloudy water blocks light needed for photosynthesis.
Reduces light penetration, decreasing productivity. Cloudy water blocks light needed for photosynthesis.
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Which biome typically has the highest primary productivity?
Which biome typically has the highest primary productivity?
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Tropical rainforests. Optimal light, temperature, and water conditions maximize production.
Tropical rainforests. Optimal light, temperature, and water conditions maximize production.
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Identify the term for ecosystems with low primary productivity.
Identify the term for ecosystems with low primary productivity.
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Oligotrophic. Nutrient-poor environments with limited producer growth.
Oligotrophic. Nutrient-poor environments with limited producer growth.
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How does nutrient availability affect primary productivity?
How does nutrient availability affect primary productivity?
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More nutrients generally increase productivity. Essential elements enable protein and chlorophyll synthesis.
More nutrients generally increase productivity. Essential elements enable protein and chlorophyll synthesis.
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Identify the main photosynthetic pigment involved in primary productivity.
Identify the main photosynthetic pigment involved in primary productivity.
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Chlorophyll. Primary pigment essential for capturing light energy.
Chlorophyll. Primary pigment essential for capturing light energy.
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What is the effect of deforestation on primary productivity?
What is the effect of deforestation on primary productivity?
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Decreases productivity by removing producers. Loss of photosynthetic biomass reduces energy capture capacity.
Decreases productivity by removing producers. Loss of photosynthetic biomass reduces energy capture capacity.
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What is the typical fate of energy not used in primary productivity?
What is the typical fate of energy not used in primary productivity?
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Lost as heat or used in respiration. Energy not converted to biomass is dissipated or consumed.
Lost as heat or used in respiration. Energy not converted to biomass is dissipated or consumed.
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