AP Environmental Science Flashcards: Aquatic Biomes

What this deck covers

This deck focuses on Aquatic Biomes, 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: What is the defining feature of estuarine ecosystems?

Answer: Mix of fresh and saltwater. Creates brackish water with salinity between freshwater and seawater.

Flashcard 2: What is the main threat to coral reefs?

Answer: Coral bleaching. Caused by warming waters and pollution stress.

Flashcard 3: Which factor primarily influences oceanic currents?

Answer: Wind patterns. Drive global circulation patterns in oceans.

Flashcard 4: What is the primary source of energy in deep ocean ecosystems?

Answer: Chemosynthesis. Using chemicals instead of sunlight for energy production.

Flashcard 5: Identify the term for areas of rapid water movement in streams.

Answer: Rapids. Fast-flowing sections with turbulent water movement.

Flashcard 6: Identify the zone in a lake where sunlight does not penetrate.

Answer: Aphotic zone. Below the euphotic zone where no photosynthesis occurs.

Flashcard 7: Identify the main type of vegetation in a marsh.

Answer: Grasses and sedges. Herbaceous plants adapted to waterlogged soils.

Flashcard 8: Which adaptation is common in fish living in the aphotic zone?

Answer: Bioluminescence. Self-produced light for communication and hunting in darkness.

Flashcard 9: Which factor primarily influences oceanic currents?

Answer: Wind patterns. Drive global circulation patterns in oceans.

Flashcard 10: What is a major human impact on freshwater biomes?

Answer: Pollution. Runoff introduces chemicals and excess nutrients.

Flashcard 11: What is the main chemical component affecting ocean acidity?

Answer: Carbon dioxide. Absorption causes ocean acidification and pH changes.

Flashcard 12: Identify the primary producers in aquatic ecosystems.

Answer: Phytoplankton. Microscopic organisms that form base of aquatic food webs.

Flashcard 13: What is the primary driver of tides in coastal regions?

Answer: Moon's gravitational pull. Creates predictable rise and fall of sea levels.

Flashcard 14: Identify the zone in the ocean where most marine life is found.

Answer: Euphotic zone. Upper sunlit layer where photosynthesis can occur.

Flashcard 15: Identify the main contribution of wetlands to biodiversity.

Answer: Provide habitat for diverse species. Transition zones support specialized species communities.

Flashcard 16: What is the primary characteristic of a freshwater biome?

Answer: Low salt concentration. Usually defined as water with less than 1% salt.

Flashcard 17: Which aquatic biome has the highest biodiversity?

Answer: Coral reefs. Support 25% of marine species despite covering less than 1% of ocean.

Flashcard 18: Identify the main type of vegetation in a marsh.

Answer: Grasses and sedges. Herbaceous plants adapted to waterlogged soils.

Flashcard 19: What is the main limiting factor for aquatic plant growth?

Answer: Light availability. Needed for photosynthesis in aquatic primary producers.

Flashcard 20: What is a major human impact on freshwater biomes?

Answer: Pollution. Runoff introduces chemicals and excess nutrients.

Flashcard 21: Which aquatic biome is characterized by brackish water?

Answer: Estuaries. Where rivers meet the sea, creating mixed salinity.

Flashcard 22: State the major role of wetlands in an ecosystem.

Answer: Water filtration and flood control. Act as natural sponges and buffer zones.

Flashcard 23: What is the primary productivity in the open ocean?

Answer: Low primary productivity. Limited by nutrient scarcity in vast open waters.

Flashcard 24: Which adaptation is common in fish living in the aphotic zone?

Answer: Bioluminescence. Self-produced light for communication and hunting in darkness.

Flashcard 25: What is the main threat to coral reefs?

Answer: Coral bleaching. Caused by warming waters and pollution stress.

Flashcard 26: Identify the primary limiting nutrient in freshwater lakes.

Answer: Phosphorus. Often limits algal growth in freshwater systems.

Flashcard 27: Which aquatic biome is known for its high nutrient levels?

Answer: Estuaries. Rivers bring nutrients that accumulate in these systems.

Flashcard 28: Identify the term for seasonal movement of lake water.

Answer: Turnover. Seasonal mixing brings nutrients from bottom to surface.

Flashcard 29: Identify the term for areas of rapid water movement in streams.

Answer: Rapids. Fast-flowing sections with turbulent water movement.

Flashcard 30: State the major role of wetlands in an ecosystem.

Answer: Water filtration and flood control. Act as natural sponges and buffer zones.

Flashcard 31: Which type of water body is characterized by standing water?

Answer: Lakes and ponds. Lentic systems with minimal water movement.

Flashcard 32: Identify the zone in a lake where sunlight does not penetrate.

Answer: Aphotic zone. Below the euphotic zone where no photosynthesis occurs.

Flashcard 33: Which biome is characterized by high salinity levels?

Answer: Marine biome. Ocean water contains about 3.5% dissolved salts.

Flashcard 34: In which aquatic biome are mangroves typically found?

Answer: Coastal wetlands. Salt-tolerant trees adapted to tidal environments.

Flashcard 35: Which aquatic biome is primarily influenced by freshwater flow?

Answer: Rivers and streams. Lotic systems with continuous water movement.

Flashcard 36: What is the primary characteristic of a freshwater biome?

Answer: Low salt concentration. Usually defined as water with less than 1% salt.

Flashcard 37: What is the main source of light in aquatic biomes?

Answer: Sunlight. Penetration decreases with depth, limiting photosynthesis.

Flashcard 38: What is the term for water's movement through a wetland?

Answer: Hydrology. How water flows through and affects wetland ecosystems.

Flashcard 39: What is the main role of decomposers in aquatic ecosystems?

Answer: Breaking down organic matter. Essential for nutrient cycling and energy flow.

Flashcard 40: Identify the primary limiting nutrient in freshwater lakes.

Answer: Phosphorus. Often limits algal growth in freshwater systems.

Flashcard 41: What is the main environmental role of mangroves?

Answer: Coastal protection. Buffer coastlines from storms and erosion.

Flashcard 42: Identify the main contribution of wetlands to biodiversity.

Answer: Provide habitat for diverse species. Transition zones support specialized species communities.

Flashcard 43: What is the main characteristic of a benthic zone?

Answer: Bottom of a body of water. Where decomposers break down organic matter.

Flashcard 44: Identify the process by which water is lost from aquatic systems.

Answer: Evaporation. Returns water to atmosphere in the water cycle.

Flashcard 45: Which biome is characterized by high salinity levels?

Answer: Marine biome. Ocean water contains about 3.5% dissolved salts.

Flashcard 46: What is a common adaptation of organisms in estuarine environments?

Answer: Tolerance to varying salinity. Allows survival in fluctuating salt concentrations.

Flashcard 47: Which aquatic biome is known for its high nutrient levels?

Answer: Estuaries. Rivers bring nutrients that accumulate in these systems.

Flashcard 48: What is the main source of light in aquatic biomes?

Answer: Sunlight. Penetration decreases with depth, limiting photosynthesis.

Flashcard 49: Which aquatic biome is characterized by brackish water?

Answer: Estuaries. Where rivers meet the sea, creating mixed salinity.

Flashcard 50: What is the primary productivity in the open ocean?

Answer: Low primary productivity. Limited by nutrient scarcity in vast open waters.

Flashcard 51: Identify the primary producers in aquatic ecosystems.

Answer: Phytoplankton. Microscopic organisms that form base of aquatic food webs.

Flashcard 52: What is the term for water's movement through a wetland?

Answer: Hydrology. How water flows through and affects wetland ecosystems.

Flashcard 53: Which aquatic biome has the highest biodiversity?

Answer: Coral reefs. Support 25% of marine species despite covering less than 1% of ocean.

Flashcard 54: What is the primary source of energy in deep ocean ecosystems?

Answer: Chemosynthesis. Using chemicals instead of sunlight for energy production.

Flashcard 55: What is the main characteristic of a benthic zone?

Answer: Bottom of a body of water. Where decomposers break down organic matter.

Flashcard 56: Define the littoral zone of a freshwater biome.

Answer: Near shore area where sunlight penetrates. Shallow area supporting most aquatic plant life.

Flashcard 57: Identify the process by which water is lost from aquatic systems.

Answer: Evaporation. Returns water to atmosphere in the water cycle.

Flashcard 58: What is the main chemical component affecting ocean acidity?

Answer: Carbon dioxide. Absorption causes ocean acidification and pH changes.

Flashcard 59: Define the littoral zone of a freshwater biome.

Answer: Near shore area where sunlight penetrates. Shallow area supporting most aquatic plant life.

Flashcard 60: Identify the largest biome on Earth by volume.

Answer: Ocean biome. Covers about 71% of Earth's surface.

Flashcard 61: In which aquatic biome are mangroves typically found?

Answer: Coastal wetlands. Salt-tolerant trees adapted to tidal environments.

Flashcard 62: Which type of water body is characterized by standing water?

Answer: Lakes and ponds. Lentic systems with minimal water movement.

Flashcard 63: What is a defining feature of the pelagic zone?

Answer: Open water area. Away from shore in the water column.

Flashcard 64: What is the defining feature of estuarine ecosystems?

Answer: Mix of fresh and saltwater. Creates brackish water with salinity between freshwater and seawater.

Flashcard 65: What is the main environmental role of mangroves?

Answer: Coastal protection. Buffer coastlines from storms and erosion.

Flashcard 66: What is a primary characteristic of the intertidal zone?

Answer: Exposure to air at low tide. Organisms must adapt to alternating wet and dry conditions.

Flashcard 67: Identify the term for seasonal movement of lake water.

Answer: Turnover. Seasonal mixing brings nutrients from bottom to surface.

Flashcard 68: What is the main role of decomposers in aquatic ecosystems?

Answer: Breaking down organic matter. Essential for nutrient cycling and energy flow.

Flashcard 69: Identify the zone in the ocean where most marine life is found.

Answer: Euphotic zone. Upper sunlit layer where photosynthesis can occur.

Flashcard 70: What is a primary characteristic of the intertidal zone?

Answer: Exposure to air at low tide. Organisms must adapt to alternating wet and dry conditions.

Flashcard 71: Which aquatic biome is primarily influenced by freshwater flow?

Answer: Rivers and streams. Lotic systems with continuous water movement.

Flashcard 72: What is a common adaptation of organisms in estuarine environments?

Answer: Tolerance to varying salinity. Allows survival in fluctuating salt concentrations.

Flashcard 73: State the main difference between rivers and streams.

Answer: Rivers are larger than streams. Size and flow volume distinguish these water bodies.

Flashcard 74: Identify the largest biome on Earth by volume.

Answer: Ocean biome. Covers about 71% of Earth's surface.

Flashcard 75: What is the main feature of the bathyal zone?

Answer: Low light penetration. Deep ocean zone with minimal sunlight penetration.

Flashcard 76: What is the primary driver of tides in coastal regions?

Answer: Moon's gravitational pull. Creates predictable rise and fall of sea levels.