AP Environmental Science Flashcards: Primary Productivity

What this deck covers

This deck focuses on Primary Productivity, giving you a quick way to review the definitions, rules, and examples that matter most for AP Environmental Science.

How to use these flashcards

Work through these flashcards in short sessions. Try to answer each prompt before flipping the card, then revisit any cards you miss until the explanation feels automatic.

Flashcard 1: How does water availability influence primary productivity?

Answer: More water generally increases productivity. Water is essential for photosynthesis and plant growth.

Flashcard 2: Which factors most directly affect primary productivity in aquatic ecosystems?

Answer: Light availability and nutrient concentration. These factors control photosynthesis rates in water ecosystems.

Flashcard 3: Identify the main photosynthetic pigment involved in primary productivity.

Answer: Chlorophyll. Primary pigment essential for capturing light energy.

Flashcard 4: What is the primary source of energy for primary productivity?

Answer: Sunlight. Solar radiation provides energy for photosynthetic processes.

Flashcard 5: Identify the main process through which primary productivity occurs.

Answer: Photosynthesis. Plants convert sunlight to chemical energy through this process.

Flashcard 6: Define Gross Primary Productivity (GPP).

Answer: Total amount of energy captured by producers. All energy captured before any metabolic costs are subtracted.

Flashcard 7: What is the definition of primary productivity?

Answer: Rate at which energy is converted by photosynthetic organisms. Energy conversion drives all food webs and ecosystem functions.

Flashcard 8: What is the typical method for estimating aquatic primary productivity?

Answer: Measuring oxygen production or carbon uptake. Direct measurement of photosynthetic gas exchange rates.

Flashcard 9: State the primary productivity formula in terms of energy.

Answer: Productivity = Energy captured - Energy respired. Net energy available after accounting for metabolic costs.

Flashcard 10: What is the definition of primary productivity?

Answer: Rate at which energy is converted by photosynthetic organisms. Energy conversion drives all food webs and ecosystem functions.

Flashcard 11: How does soil fertility impact primary productivity in terrestrial ecosystems?

Answer: Higher fertility enhances productivity. Rich soils provide essential nutrients for plant growth.

Flashcard 12: How does nutrient availability affect primary productivity?

Answer: More nutrients generally increase productivity. Essential elements enable protein and chlorophyll synthesis.

Flashcard 13: State the equation representing primary productivity in terms of biomass.

Answer: Productivity = Biomass gain - Biomass loss. Net growth represents successful energy conversion to biomass.

Flashcard 14: Define Gross Primary Productivity (GPP).

Answer: Total amount of energy captured by producers. All energy captured before any metabolic costs are subtracted.

Flashcard 15: What limits primary productivity in deep ocean zones?

Answer: Lack of sunlight. Light cannot penetrate to support photosynthesis at depth.

Flashcard 16: What is the role of chlorophyll in primary productivity?

Answer: Absorbs light energy for photosynthesis. Essential pigment captures light energy for carbon fixation.

Flashcard 17: What limits primary productivity in deep ocean zones?

Answer: Lack of sunlight. Light cannot penetrate to support photosynthesis at depth.

Flashcard 18: State the primary productivity formula in terms of energy.

Answer: Productivity = Energy captured - Energy respired. Net energy available after accounting for metabolic costs.

Flashcard 19: State the formula to calculate Net Primary Productivity (NPP).

Answer: NPP = GPP - R. Net equals gross minus respiratory energy losses.

Flashcard 20: Why is primary productivity important for ecosystems?

Answer: Provides energy base for food webs. Producers form the foundation supporting all other trophic levels.

Flashcard 21: What is the role of producers in an ecosystem's energy flow?

Answer: Convert solar energy into chemical energy. Primary producers capture and store energy for ecosystem use.

Flashcard 22: What is the role of producers in an ecosystem's energy flow?

Answer: Convert solar energy into chemical energy. Primary producers capture and store energy for ecosystem use.

Flashcard 23: Which factors most directly affect primary productivity in aquatic ecosystems?

Answer: Light availability and nutrient concentration. These factors control photosynthesis rates in water ecosystems.

Flashcard 24: How does soil fertility impact primary productivity in terrestrial ecosystems?

Answer: Higher fertility enhances productivity. Rich soils provide essential nutrients for plant growth.

Flashcard 25: What is the effect of increased carbon dioxide on primary productivity?

Answer: Can increase productivity by enhancing photosynthesis. More $CO_2$ provides additional substrate for photosynthesis.

Flashcard 26: How does temperature affect primary productivity?

Answer: Higher temperatures generally increase productivity. Warmer conditions accelerate enzymatic photosynthetic reactions.

Flashcard 27: Which term describes a nutrient-rich environment with high primary productivity?

Answer: Eutrophic. High nutrient levels support abundant producer growth.

Flashcard 28: What is the relationship between biodiversity and primary productivity?

Answer: Higher biodiversity can increase productivity. More species can utilize resources more efficiently.

Flashcard 29: What is the role of chlorophyll in primary productivity?

Answer: Absorbs light energy for photosynthesis. Essential pigment captures light energy for carbon fixation.

Flashcard 30: Which term describes a nutrient-rich environment with high primary productivity?

Answer: Eutrophic. High nutrient levels support abundant producer growth.

Flashcard 31: State the formula for calculating Gross Primary Productivity (GPP).

Answer: GPP = NPP + R. Gross productivity equals net productivity plus respiration costs.

Flashcard 32: Which aquatic zones are known for high primary productivity?

Answer: Coastal zones and estuaries. Nutrient-rich shallow waters support abundant photosynthetic organisms.

Flashcard 33: How does increased turbidity affect aquatic primary productivity?

Answer: Reduces light penetration, decreasing productivity. Cloudy water blocks light needed for photosynthesis.

Flashcard 34: Identify the term for ecosystems with low primary productivity.

Answer: Oligotrophic. Nutrient-poor environments with limited producer growth.

Flashcard 35: How is primary productivity measured in terrestrial ecosystems?

Answer: By plant biomass accumulation. Growth represents successful energy conversion to organic matter.

Flashcard 36: What does NPP stand for in the context of primary productivity?

Answer: Net Primary Productivity. Energy available to consumers after producer respiration losses.

Flashcard 37: Identify the main process through which primary productivity occurs.

Answer: Photosynthesis. Plants convert sunlight to chemical energy through this process.

Flashcard 38: State the formula to calculate Net Primary Productivity (NPP).

Answer: NPP = GPP - R. Net equals gross minus respiratory energy losses.

Flashcard 39: Identify the term for ecosystems with low primary productivity.

Answer: Oligotrophic. Nutrient-poor environments with limited producer growth.

Flashcard 40: What does the 'R' represent in the formula GPP = NPP + R?

Answer: Respiration by producers. Energy used by producers for their own metabolic processes.

Flashcard 41: How is primary productivity measured in terrestrial ecosystems?

Answer: By plant biomass accumulation. Growth represents successful energy conversion to organic matter.

Flashcard 42: What is the unit commonly used for measuring primary productivity?

Answer: gC/m²/yr (grams of carbon per square meter per year). Standard unit measures carbon fixed per area per time.

Flashcard 43: State the formula for calculating Gross Primary Productivity (GPP).

Answer: GPP = NPP + R. Gross productivity equals net productivity plus respiration costs.

Flashcard 44: Identify the main photosynthetic pigment involved in primary productivity.

Answer: Chlorophyll. Primary pigment essential for capturing light energy.

Flashcard 45: What is the effect of high altitude on primary productivity?

Answer: Generally decreases due to lower temperatures. Cold temperatures slow photosynthetic enzyme activity.

Flashcard 46: What is the effect of increased carbon dioxide on primary productivity?

Answer: Can increase productivity by enhancing photosynthesis. More $CO_2$ provides additional substrate for photosynthesis.

Flashcard 47: State the equation representing primary productivity in terms of biomass.

Answer: Productivity = Biomass gain - Biomass loss. Net growth represents successful energy conversion to biomass.

Flashcard 48: Which factor is a limiting factor for primary productivity in freshwater lakes?

Answer: Phosphorus. Essential nutrient often limiting algal growth in freshwater.

Flashcard 49: How does increased turbidity affect aquatic primary productivity?

Answer: Reduces light penetration, decreasing productivity. Cloudy water blocks light needed for photosynthesis.

Flashcard 50: What does NPP stand for in the context of primary productivity?

Answer: Net Primary Productivity. Energy available to consumers after producer respiration losses.

Flashcard 51: What is the significance of the compensation point in photosynthesis?

Answer: Where photosynthesis equals respiration. Light intensity balances photosynthesis and respiration rates.

Flashcard 52: Identify the major limiting nutrient for primary productivity in oceans.

Answer: Nitrogen. Essential for protein synthesis and chlorophyll production.

Flashcard 53: Which biome typically has the highest primary productivity?

Answer: Tropical rainforests. Optimal light, temperature, and water conditions maximize production.

Flashcard 54: What is the unit commonly used for measuring primary productivity?

Answer: gC/m²/yr (grams of carbon per square meter per year). Standard unit measures carbon fixed per area per time.

Flashcard 55: Define Net Primary Productivity (NPP).

Answer: Energy remaining after respiration by producers. Available energy after plants use some for their own metabolism.

Flashcard 56: What is the effect of deforestation on primary productivity?

Answer: Decreases productivity by removing producers. Loss of photosynthetic biomass reduces energy capture capacity.

Flashcard 57: Which type of ecosystem typically exhibits the lowest primary productivity?

Answer: Deserts. Limited water and extreme temperatures restrict plant growth.

Flashcard 58: What is the typical method for estimating aquatic primary productivity?

Answer: Measuring oxygen production or carbon uptake. Direct measurement of photosynthetic gas exchange rates.

Flashcard 59: What does the 'R' represent in the formula GPP = NPP + R?

Answer: Respiration by producers. Energy used by producers for their own metabolic processes.

Flashcard 60: Why is primary productivity important for ecosystems?

Answer: Provides energy base for food webs. Producers form the foundation supporting all other trophic levels.

Flashcard 61: What is the typical fate of energy not used in primary productivity?

Answer: Lost as heat or used in respiration. Energy not converted to biomass is dissipated or consumed.

Flashcard 62: What is the relationship between biodiversity and primary productivity?

Answer: Higher biodiversity can increase productivity. More species can utilize resources more efficiently.

Flashcard 63: How does water availability influence primary productivity?

Answer: More water generally increases productivity. Water is essential for photosynthesis and plant growth.

Flashcard 64: What is the effect of deforestation on primary productivity?

Answer: Decreases productivity by removing producers. Loss of photosynthetic biomass reduces energy capture capacity.

Flashcard 65: How does temperature affect primary productivity?

Answer: Higher temperatures generally increase productivity. Warmer conditions accelerate enzymatic photosynthetic reactions.

Flashcard 66: What is the significance of the compensation point in photosynthesis?

Answer: Where photosynthesis equals respiration. Light intensity balances photosynthesis and respiration rates.

Flashcard 67: Which type of ecosystem typically exhibits the lowest primary productivity?

Answer: Deserts. Limited water and extreme temperatures restrict plant growth.

Flashcard 68: Which aquatic zones are known for high primary productivity?

Answer: Coastal zones and estuaries. Nutrient-rich shallow waters support abundant photosynthetic organisms.

Flashcard 69: Identify the major limiting nutrient for primary productivity in oceans.

Answer: Nitrogen. Essential for protein synthesis and chlorophyll production.

Flashcard 70: What is the primary source of energy for primary productivity?

Answer: Sunlight. Solar radiation provides energy for photosynthetic processes.

Flashcard 71: What is the effect of high altitude on primary productivity?

Answer: Generally decreases due to lower temperatures. Cold temperatures slow photosynthetic enzyme activity.

Flashcard 72: Which factor is a limiting factor for primary productivity in freshwater lakes?

Answer: Phosphorus. Essential nutrient often limiting algal growth in freshwater.

Flashcard 73: Which biome typically has the highest primary productivity?

Answer: Tropical rainforests. Optimal light, temperature, and water conditions maximize production.

Flashcard 74: How does nutrient availability affect primary productivity?

Answer: More nutrients generally increase productivity. Essential elements enable protein and chlorophyll synthesis.

Flashcard 75: Define Net Primary Productivity (NPP).

Answer: Energy remaining after respiration by producers. Available energy after plants use some for their own metabolism.

Flashcard 76: What is the typical fate of energy not used in primary productivity?

Answer: Lost as heat or used in respiration. Energy not converted to biomass is dissipated or consumed.