AP Environmental Science Flashcards: Trophic Levels

What this deck covers

This deck focuses on Trophic Levels, 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: Identify a primary producer in an aquatic ecosystem.

Answer: Phytoplankton. Microscopic plants that form the base of marine food webs.

Flashcard 2: What term describes the total energy captured by producers?

Answer: Gross primary productivity. Total energy fixed by photosynthesis before respiration losses.

Flashcard 3: What is the role of decomposers in an ecosystem?

Answer: Break down dead material and recycle nutrients. Essential for nutrient cycling in ecosystems.

Flashcard 4: Identify the type of consumer that eats both plants and animals.

Answer: Omnivores. They can function at multiple trophic levels simultaneously.

Flashcard 5: Identify the primary producers in a terrestrial ecosystem.

Answer: Plants. They convert sunlight into chemical energy through photosynthesis.

Flashcard 6: What is net primary productivity?

Answer: Energy available to consumers after plant respiration. Energy remaining after producers use some for cellular respiration.

Flashcard 7: What is a food web?

Answer: A complex network of interlinked food chains. Shows multiple feeding relationships and energy pathways.

Flashcard 8: What is the primary source of energy for most ecosystems?

Answer: Sunlight. Powers photosynthesis in primary producers.

Flashcard 9: What is a pyramid of biomass?

Answer: A graphical representation of biomass at each trophic level. Typically pyramid-shaped due to energy loss at each level.

Flashcard 10: Identify the type of consumer that eats both plants and animals.

Answer: Omnivores. They can function at multiple trophic levels simultaneously.

Flashcard 11: Name an organism that functions as a decomposer.

Answer: Fungi. Breaks down organic matter and recycles nutrients.

Flashcard 12: Identify the process through which energy is transferred in food webs.

Answer: Consumption. One organism eating another transfers energy up trophic levels.

Flashcard 13: What trophic level do carnivores that eat herbivores occupy?

Answer: Secondary consumers. They consume primary consumers (herbivores).

Flashcard 14: Which organisms are considered heterotrophs?

Answer: Consumers (herbivores, carnivores, omnivores). They cannot produce their own food and must consume other organisms.

Flashcard 15: Which organisms are at the base of the food chain in the ocean?

Answer: Phytoplankton. Primary producers that convert sunlight into chemical energy.

Flashcard 16: Which trophic level do herbivores belong to?

Answer: Primary consumers. They feed directly on producers (plants).

Flashcard 17: Identify the top predators in a food chain.

Answer: Tertiary consumers. They eat secondary consumers and have few natural predators.

Flashcard 18: What is the definition of a trophic level?

Answer: A rank in the food chain or food web of an ecosystem. Shows feeding positions and energy flow in ecosystems.

Flashcard 19: State one consequence of removing a top predator from an ecosystem.

Answer: Disruption of trophic balance. Can lead to prey population explosions and ecosystem instability.

Flashcard 20: Identify the top predators in a food chain.

Answer: Tertiary consumers. They eat secondary consumers and have few natural predators.

Flashcard 21: What is the primary source of energy for most ecosystems?

Answer: Sunlight. Powers photosynthesis in primary producers.

Flashcard 22: Identify a factor that affects the length of food chains.

Answer: Energy availability. Limited energy restricts the number of sustainable trophic levels.

Flashcard 23: Which process converts solar energy into chemical energy?

Answer: Photosynthesis. Used by plants to create glucose from carbon dioxide and water.

Flashcard 24: What is the term for energy lost as heat at each trophic level?

Answer: Entropy. Energy dissipated during metabolic processes at each level.

Flashcard 25: Identify the initial energy source for chemosynthetic ecosystems.

Answer: Chemical energy from hydrothermal vents. Used by chemosynthetic bacteria instead of sunlight.

Flashcard 26: Which trophic level contains organisms like mushrooms?

Answer: Decomposers. Fungi that break down dead organic material.

Flashcard 27: Identify a factor that affects the length of food chains.

Answer: Energy availability. Limited energy restricts the number of sustainable trophic levels.

Flashcard 28: Identify the initial energy source for chemosynthetic ecosystems.

Answer: Chemical energy from hydrothermal vents. Used by chemosynthetic bacteria instead of sunlight.

Flashcard 29: Define biomass in the context of trophic levels.

Answer: Total mass of organisms at a trophic level. Decreases at higher trophic levels due to energy loss.

Flashcard 30: What term describes the total energy captured by producers?

Answer: Gross primary productivity. Total energy fixed by photosynthesis before respiration losses.

Flashcard 31: Which level of the food web do detritivores belong to?

Answer: Decomposers. They consume dead organic matter and waste products.

Flashcard 32: What is the significance of the 10% rule in energy transfer?

Answer: Only 10% of energy is passed to the next trophic level. Explains why food chains are typically short.

Flashcard 33: Which trophic level has the most available energy?

Answer: Primary producers. They capture energy directly from the sun through photosynthesis.

Flashcard 34: What is the role of omnivores in a food chain?

Answer: Consume both plants and animals. They occupy multiple trophic levels as both primary and secondary consumers.

Flashcard 35: What is the significance of keystone species in trophic levels?

Answer: They play a critical role in maintaining ecosystem balance. Their removal can cause cascading effects throughout the ecosystem.

Flashcard 36: What is a food web?

Answer: A complex network of interlinked food chains. Shows multiple feeding relationships and energy pathways.

Flashcard 37: Which process converts solar energy into chemical energy?

Answer: Photosynthesis. Used by plants to create glucose from carbon dioxide and water.

Flashcard 38: Which trophic level do herbivores belong to?

Answer: Primary consumers. They feed directly on producers (plants).

Flashcard 39: Name an organism that functions as a decomposer.

Answer: Fungi. Breaks down organic matter and recycles nutrients.

Flashcard 40: What percentage of energy is typically lost between trophic levels?

Answer: 90%. Due to metabolic processes and heat loss.

Flashcard 41: What is the primary purpose of a food chain?

Answer: To illustrate energy flow through an ecosystem. Shows the linear transfer of energy between organisms.

Flashcard 42: State the formula for calculating energy transfer efficiency.

Answer: $\frac{\text{Energy at higher trophic level}}{\text{Energy at lower trophic level}} \times 100$. Measures the percentage of energy transferred between levels.

Flashcard 43: What is the typical energy transfer efficiency between trophic levels?

Answer: Approximately 10%. Known as the 10% rule in ecology.

Flashcard 44: What is the primary purpose of a food chain?

Answer: To illustrate energy flow through an ecosystem. Shows the linear transfer of energy between organisms.

Flashcard 45: State one consequence of removing a top predator from an ecosystem.

Answer: Disruption of trophic balance. Can lead to prey population explosions and ecosystem instability.

Flashcard 46: What is the role of omnivores in a food chain?

Answer: Consume both plants and animals. They occupy multiple trophic levels as both primary and secondary consumers.

Flashcard 47: Identify a key difference between food webs and food chains.

Answer: Food webs show multiple interactions; chains are linear. Webs are more realistic representations of ecosystem complexity.

Flashcard 48: Which organisms are at the base of the food chain in the ocean?

Answer: Phytoplankton. Primary producers that convert sunlight into chemical energy.

Flashcard 49: What is the role of decomposers in an ecosystem?

Answer: Break down dead material and recycle nutrients. Essential for nutrient cycling in ecosystems.

Flashcard 50: What is a pyramid of biomass?

Answer: A graphical representation of biomass at each trophic level. Typically pyramid-shaped due to energy loss at each level.

Flashcard 51: What is the term for energy lost as heat at each trophic level?

Answer: Entropy. Energy dissipated during metabolic processes at each level.

Flashcard 52: What term describes organisms that produce their own food?

Answer: Autotrophs. They make their own food through photosynthesis or chemosynthesis.

Flashcard 53: Define biomass in the context of trophic levels.

Answer: Total mass of organisms at a trophic level. Decreases at higher trophic levels due to energy loss.

Flashcard 54: Which organisms are considered heterotrophs?

Answer: Consumers (herbivores, carnivores, omnivores). They cannot produce their own food and must consume other organisms.

Flashcard 55: What term describes organisms that produce their own food?

Answer: Autotrophs. They make their own food through photosynthesis or chemosynthesis.

Flashcard 56: What is the typical energy transfer efficiency between trophic levels?

Answer: Approximately 10%. Known as the 10% rule in ecology.

Flashcard 57: What is the definition of a trophic level?

Answer: A rank in the food chain or food web of an ecosystem. Shows feeding positions and energy flow in ecosystems.

Flashcard 58: What is the name for organisms that feed exclusively on plants?

Answer: Herbivores. Primary consumers that only eat plant material.

Flashcard 59: What is the significance of keystone species in trophic levels?

Answer: They play a critical role in maintaining ecosystem balance. Their removal can cause cascading effects throughout the ecosystem.

Flashcard 60: What is the significance of the 10% rule in energy transfer?

Answer: Only 10% of energy is passed to the next trophic level. Explains why food chains are typically short.

Flashcard 61: Identify a key difference between food webs and food chains.

Answer: Food webs show multiple interactions; chains are linear. Webs are more realistic representations of ecosystem complexity.

Flashcard 62: What is the name for organisms that feed exclusively on plants?

Answer: Herbivores. Primary consumers that only eat plant material.

Flashcard 63: Identify the primary producers in a terrestrial ecosystem.

Answer: Plants. They convert sunlight into chemical energy through photosynthesis.

Flashcard 64: Which level of the food web do detritivores belong to?

Answer: Decomposers. They consume dead organic matter and waste products.

Flashcard 65: Which trophic level has the most available energy?

Answer: Primary producers. They capture energy directly from the sun through photosynthesis.

Flashcard 66: Which trophic level contains organisms like mushrooms?

Answer: Decomposers. Fungi that break down dead organic material.

Flashcard 67: What is the role of an apex predator?

Answer: Top of the food chain; no natural predators. Controls prey populations and maintains ecosystem balance.

Flashcard 68: Identify the process through which energy is transferred in food webs.

Answer: Consumption. One organism eating another transfers energy up trophic levels.

Flashcard 69: What is net primary productivity?

Answer: Energy available to consumers after plant respiration. Energy remaining after producers use some for cellular respiration.

Flashcard 70: State the formula for calculating energy transfer efficiency.

Answer: $\frac{\text{Energy at higher trophic level}}{\text{Energy at lower trophic level}} \times 100$. Measures the percentage of energy transferred between levels.

Flashcard 71: What percentage of energy is typically lost between trophic levels?

Answer: 90%. Due to metabolic processes and heat loss.

Flashcard 72: What trophic level do carnivores that eat herbivores occupy?

Answer: Secondary consumers. They consume primary consumers (herbivores).

Flashcard 73: Identify a primary producer in an aquatic ecosystem.

Answer: Phytoplankton. Microscopic plants that form the base of marine food webs.

Flashcard 74: What is the role of an apex predator?

Answer: Top of the food chain; no natural predators. Controls prey populations and maintains ecosystem balance.