Model Food Webs - Middle School Life Science

Which direction should an arrow point: from predator to prey, or from prey to predator?

From prey to predator. Energy flows from the eaten to the eater.
What is the main difference between a food chain and a food web model?

A chain is one path; a web shows many interconnected paths. Webs capture the complexity of real ecosystems.
What is a secondary consumer in a food web?

An organism that eats primary consumers. Second level consumers, often carnivores.
Which direction should the arrow point: snake eats mouse; mouse → snake or snake → mouse?

mouse → snake. Arrows point from food source to consumer.
Which organism is the decomposer in this list: mushroom, deer, wolf, grass?

Mushroom. Fungi break down organic matter for nutrients.
Which option is a correct food chain order: producer → consumer or consumer → producer?

Producer → consumer. Energy always flows from producers upward.
Which statement correctly compares a food chain and a food web?

A chain is one path; a web shows many interconnected paths. Webs better represent complex ecosystem relationships.
What do arrows represent in a food web model?

Direction of energy flow from food to consumer. Points from prey to predator, tracking energy transfer.
What is a decomposer and what is its role in a food web?

An organism that breaks down dead matter and recycles nutrients. Returns nutrients to soil for producer use.
What is a keystone species in a food web model?

A species with a disproportionately large effect on the ecosystem. Its removal dramatically alters ecosystem balance.
What is an omnivore in a food web model?

A consumer that eats both producers and consumers. Has varied diet from multiple trophic levels.
What is a scavenger in a food web model?

An organism that eats dead animals without breaking them down chemically. Differs from decomposers by not chemically breaking down tissue.
Identify the missing label: plant > rabbit > fox.

Producer > primary consumer > secondary consumer. Shows energy flow through three trophic levels.
What do the arrows in a food web model represent?

The direction of energy transfer from food to consumer. Shows who eats whom and the path energy takes.
Identify what happens in a food web model if a top predator is removed from the ecosystem.

Prey populations often increase, causing cascading changes. Loss of predation pressure affects entire web.
Identify the trophic level of grass in a food web: grass → rabbit → fox.

Producer. Grass produces its own food through photosynthesis.
Which statement best describes why food webs are useful models of ecosystems?

They show multiple energy pathways and interdependence. Real ecosystems have complex, interconnected feeding relationships.
Which organism is the predator if the arrow is from mouse to owl in a food web model?

Owl. The organism the arrow points to is the predator.
What is a food web in an ecosystem model?

A model showing interconnected food chains and feeding relationships. Shows multiple pathways of energy flow, unlike a single food chain.
What is a tertiary consumer in a food web model?

An organism that eats secondary consumers. Third level consumers, often apex predators.
Identify the shared food source: fox eats rabbit and mouse; rabbit and mouse are both ____ of fox.

Prey. Both serve as food sources for the fox.
What do arrows represent in a food web model?

The direction of energy transfer between organisms. Energy flows from eaten to eater.
What is a detritivore in a food web model?

An organism that eats dead organic matter (detritus). Feeds on dead material rather than living organisms.
Identify the trophic role of a rabbit that eats grass in a food web model.

Primary consumer. Herbivores are always primary consumers.
Which direction should an arrow point: prey to predator or predator to prey?

Prey to predator. Arrows show energy flow from eaten to eater.
What is a detritivore in a food web?

An organism that eats detritus (dead organic material). Feeds on dead material before decomposers break it down.
If a primary consumer population decreases, what is the most direct effect on its predator?

The predator population tends to decrease. Less food means fewer predators can survive.
Identify the role of algae in an aquatic food web model.

Producer. Photosynthetic organisms are always producers.
Which direction should the arrow point: grass eaten by rabbit in a food web model?

Grass e2c2a0e2c292e2c2a0 Rabbit. Arrow points from food source to consumer.
Which statement best distinguishes a food chain from a food web?

A chain is one path; a web shows many connected paths. Webs show complex interconnections, not single paths.
What is a trophic level in a food web?

A feeding position based on how an organism gets energy. Ranks organisms by their energy source in the web.
Identify the predator: hawk eats snake; which organism is the predator in this link?

Hawk. The hunter in a predator-prey relationship.
What do arrows represent in a food web model?

Direction of energy transfer from food to consumer. Energy flows from prey to predator along the arrow.
Which option best completes the chain to show energy flow: phytoplankton → krill → ____ (a krill-eating animal)?

Baleen whale. Baleen whales filter-feed on krill in marine ecosystems.
Identify the missing arrow direction: insect ___ frog (energy flow).

Insect → frog. Arrow shows energy flowing from prey to predator.
What is a food web in an ecosystem model?

A model showing interconnected feeding relationships among organisms. Shows how multiple organisms feed on each other in complex patterns.
Identify the trophic level of a wolf in this chain: grass → deer → wolf.

Secondary consumer. Wolf eats herbivores, placing it two levels above producers.
What do arrows in a food web model represent?

Direction of energy transfer from food to consumer. Points from prey to predator, showing energy flow.
What is an omnivore in a food web?

An organism that eats both producers and consumers. Has a varied diet spanning multiple trophic levels.
Which trophic level includes organisms that make their own food?

Producers (autotrophs). They convert sunlight/chemicals into food energy.
What is the difference between a food chain and a food web?

A chain is one pathway; a web is many linked pathways. Webs show complex, realistic ecosystem interactions.
Which option best describes a keystone species in a food web model?

A species with a disproportionately large effect on the ecosystem. Their removal dramatically alters ecosystem balance.
What do arrows represent in a food web model?

Direction of energy transfer from food to consumer. Energy flows in the direction arrows point.
What is a decomposer, and what role does it play in a food web?

Breaks down dead matter and recycles nutrients to the ecosystem. Essential for nutrient cycling in ecosystems.
What is a food web model in an ecosystem?

A diagram showing interconnected feeding relationships among organisms. Shows who eats whom in an ecosystem.
Identify the trophic level of a hawk that eats a snake that ate a mouse.

Tertiary consumer. Hawk eats secondary consumer (snake), making it third-level.
What is a tertiary consumer in a food web?

A consumer that eats secondary consumers. Third-level consumers in the energy transfer sequence.
Identify the trophic level: rabbit eats grass; rabbit is a ____ consumer.

Primary. Herbivores are first-level consumers of plants.
What is a scavenger in a food web model?

An organism that eats dead animals without hunting them. Feeds on carrion rather than live prey.
What is the main difference between a food chain and a food web model?

A chain is one path; a web shows many interconnected paths. Webs capture the complexity of real ecosystems.
What is an apex predator in a food web?

A top consumer with no natural predators in that web. Sits at the highest trophic level in its ecosystem.
What is a tertiary consumer in a food web model?

An organism that eats secondary consumers. Third-level consumers, often near the top of the food web.
Identify the trophic role of a snake that eats mice in a food web model.

Secondary consumer. Mice are herbivores, making snake a secondary consumer.
What do arrows represent in a food web model?

Direction of energy transfer from food to consumer. Points from eaten to eater, showing energy flow.
Find and correct the arrow error: hawk → mouse (hawk eats mouse).

Correct: mouse → hawk. Arrow should point toward the consumer.
Identify the missing role: algae → zooplankton → small fish; algae is a ____.

Producer. Algae performs photosynthesis at the base of aquatic webs.
What is the term for multiple connected food chains sharing organisms in the same ecosystem?

Food web. More realistic than chains as organisms have multiple food sources.
Identify the term for an organism that eats only plants in a food web.

Herbivore. Plant-eater that serves as a primary consumer.
What is a secondary consumer in a food web model?

An organism that eats primary consumers. Second level consumers, typically carnivores.
Identify the error: An arrow points from a fox to a rabbit to show the fox eats it.

Reverse it: arrow should point from rabbit to fox. Arrows point toward the consumer, not the food.
Which trophic level contains producers in a food web model?

The first trophic level. Producers form the base of all food webs.
Which organisms should be placed at the base of a food web model?

Producers. They're the primary energy source for all consumers.
Identify the trophic role of a hawk that eats snakes in a food web model.

Tertiary consumer. Hawks eating secondary consumers are tertiary.
Which term describes an organism that eats both plants and animals in a food web?

Omnivore. Has a varied diet including both producers and consumers.
Which organisms are producers in a food web?

Autotrophs that make food, such as plants and algae. They convert sunlight/chemicals into organic matter.
Identify the trophic level of algae in an aquatic food web model.

Producer. Algae photosynthesize, making them producers.
Identify the term for an organism that eats only animals in a food web.

Carnivore. Meat-eater that occupies higher trophic levels.
Identify the trophic level of rabbit in a food web: grass → rabbit → fox.

Primary consumer. Rabbit eats the producer (grass).
What is a producer in a food web model?

An organism that makes its own food, usually by photosynthesis. They convert sunlight into chemical energy.
Identify the trophic role of algae in a typical pond food web model.

Producer. Algae photosynthesize like plants do.
What is a producer in a food web model?

An organism that makes its own food, usually by photosynthesis. Forms the base of food webs as energy source.
Identify the prey: hawk eats snake; which organism is the prey in this link?

Snake. The hunted organism provides energy to predator.
Which direction should an arrow point: from predator to prey or prey to predator?

From prey to predator. Energy flows in the direction of consumption.
What is a trophic level in a food web model?

A feeding position based on how an organism gets energy. Each level represents a step in energy transfer.
What is a producer in a food web model?

An organism that makes its own food, usually by photosynthesis. Plants and algae are common examples.
What is a scavenger in a food web model?

An organism that eats dead organisms without breaking them down chemically. Feeds on carrion but doesn't decompose it chemically.
Which term describes a consumer that eats only animals in a food web?

Carnivore. Gets all energy from consuming other animals.
What is a producer in a food web model?

An organism that makes its own food, usually by photosynthesis. Forms the base of the food web.
Which organism is the primary consumer: grass, grasshopper, or hawk?

Grasshopper. Grasshopper eats grass, making it a primary consumer.
Identify the trophic role of grass in a food web.

Producer. Grass makes its own food through photosynthesis.
Which organisms should appear at the base of a food web model?

Producers. All energy in ecosystems originates from producers.
What is a producer in a food web model?

An organism that makes its own food, usually by photosynthesis. Forms the base of food webs as the primary energy source.
What is an apex predator in a food web model?

A top consumer with no natural predators in that web. Sits at the top of the food web.
Which direction should the arrow point: grass and deer, if deer eats grass?

Grass > deer. Arrow points from food source to consumer.
What is a primary consumer in a food web model?

An organism that eats producers. First level of consumers, often herbivores.
Identify the term for an organism that eats both plants and animals in a food web.

Omnivore. Has a varied diet spanning multiple trophic levels.
Which trophic level contains the greatest total energy in most ecosystems?

Producers. Energy decreases at each higher trophic level.
Identify the role of fungi and many bacteria in most food webs.

Decomposers. They recycle nutrients from dead organisms.
What is the ultimate original source of energy for most food webs on Earth?

Sunlight. Producers convert solar energy to chemical energy.
Find the producer: grass, grasshopper, frog, snake, hawk; which is the producer?

Grass. Only grass makes its own food through photosynthesis.
Which term describes a species that strongly affects many parts of a food web?

Keystone species. Its removal causes major ecosystem changes.
What is a carnivore in a food web model?

A consumer that eats other animals. Meat-eaters occupy higher trophic levels.
What is an omnivore in a food web model?

A consumer that eats both producers and consumers. Can occupy multiple trophic levels.
What is a producer in a food web?

An autotroph that makes its own food, usually by photosynthesis. Forms the base of food webs by converting sunlight to food.
Which organism is the producer: algae, minnow, or heron?

Algae. Only algae produces its own food through photosynthesis.
Find and correct the arrow error: "fox e2c292 rabbit" when the fox eats the rabbit.

Correct: rabbit e2c2a0e2c292e2c2a0 fox. Arrow must point from prey to predator.
What is a keystone species in a food web model?

A species whose removal causes major ecosystem changes. Its presence maintains ecosystem balance and diversity.
What is the most likely food web effect if producers sharply decrease?

Consumer populations decrease due to reduced energy supply. Less food at the base affects all higher levels.
What is a decomposer in a food web model?

An organism that breaks down dead matter and recycles nutrients. Essential for nutrient cycling in ecosystems.
What is a secondary consumer in a food web model?

An organism that eats primary consumers. Second-level consumers in the energy transfer hierarchy.
Identify the trophic role of a hawk that eats snakes.

Tertiary consumer. Predators of secondary consumers are third-level.
What is the key difference between a food chain and a food web?

A chain is one path; a web shows many interconnected paths. Webs capture the complexity of multiple feeding relationships.
Identify the trophic role of algae in a pond food web model.

Producer. Photosynthetic organisms are always producers.
What is the difference between a scavenger and a decomposer?

Scavenger eats remains; decomposer chemically breaks them down. Scavengers consume; decomposers chemically recycle.
Which option best describes an omnivore in a food web?

An organism that eats both producers and consumers. Feeds at multiple trophic levels in the web.
What is a decomposer in a food web model?

An organism that breaks down dead matter and recycles nutrients. Essential for nutrient cycling back to producers.
What is a primary consumer in a food web?

An herbivore that eats producers. First-level consumers feed directly on plants.
Identify the mistake: algae → sunlight in a food web diagram.

Arrow is reversed; sunlight → algae is not a feeding link. Producers use sunlight but don't consume it as food.
Identify the trophic level of fox in a food web: grass → rabbit → fox.

Secondary consumer. Fox eats the primary consumer (rabbit).
Identify the trophic level of a hawk that eats snakes in a food web model.

Tertiary consumer. Third-level consumer eating secondary consumers.
What is a tertiary consumer in a food web?

An organism that eats secondary consumers. Third level consumers in the energy pyramid.
Find the error: "Arrow goes from hawk to mouse because hawk eats mouse." Correct it.

Correct: arrow goes from mouse to hawk. Arrows show energy flow from eaten to eater.
Identify the trophic role of a rabbit that eats grass.

Primary consumer. Herbivores are first-level consumers of plants.
What is a food web in an ecosystem model?

A diagram showing interconnected feeding relationships in an ecosystem. Shows multiple feeding connections, unlike linear food chains.
Identify the missing role: grass → rabbit → fox; the rabbit is a ____ consumer.

Primary consumer. Rabbit eats grass, making it first-level consumer.
What is the role of a producer in a food web model?

An organism that makes its own food, usually by photosynthesis. Forms the base of the food web by converting sunlight to chemical energy.
Identify the trophic role of a snake that eats rabbits.

Secondary consumer. Carnivores eating herbivores are second-level.
Identify the error: an arrow points from a fox to a rabbit to show the fox eats rabbit. What is the correction?

Reverse it: rabbit → fox. Arrows must point from food source to consumer.
What is an omnivore in a food web model?

A consumer that eats both producers and consumers. Has multiple food sources across trophic levels.
Which term describes a consumer that eats only animals?

Carnivore. Meat-eating consumers occupy higher trophic levels.
What is the most direct food-web result of removing most producers?

Energy input drops, causing consumer populations to decline. Producers support all higher levels with energy.
What is a decomposer and what role does it play in a food web?

Breaks down dead matter and recycles nutrients to the ecosystem. Essential for nutrient cycling in ecosystems.
What is the difference between a food chain and a food web?

Chain: one pathway; web: many interconnected pathways. Webs show realistic complexity with multiple connections.
Which organism type forms the base of most food webs: producers or consumers?

Producers. They convert sunlight into food energy for all other organisms.
What role do decomposers play in a food web model?

They break down dead matter and recycle nutrients to the ecosystem. Essential for nutrient cycling in ecosystems.
What is the key difference between a food chain and a food web?

A chain is one path; a web is many connected paths. Webs show multiple feeding relationships, not just one.
What is a limitation of food web models compared with real ecosystems?

They simplify interactions and usually omit amounts and changes over time. Real ecosystems are more complex and dynamic.
What does it mean if two consumers share the same prey in a food web?

They compete for the same food resource. Creates interspecific competition between the consumers.
Identify the trophic role of a rabbit that eats grass in a food web model.

Primary consumer. Herbivores are always primary consumers.
What do arrows represent in a food web model?

Direction of energy transfer from food source to consumer. Energy flows in the direction the arrow points.
Which organism is the producer: algae, zooplankton, small fish, or heron?

Algae. Only algae performs photosynthesis in this list.
Identify the correct arrow direction for this link: grass and grasshopper in a food web model.

Grass $\rightarrow$ grasshopper. Arrow shows energy flow from grass to grasshopper.
If a predator is removed, what is the most direct effect on its prey population?

The prey population tends to increase. No predation pressure allows population growth.
What is a food web model in an ecosystem?

A diagram showing interconnected feeding relationships among organisms. Shows multiple feeding relationships, not just single chains.
What is the correct direction of arrows in a food web?

From food source (prey) to consumer (predator). Energy flows from eaten to eater.
Identify the trophic role of a snake that eats mice that eat seeds in a food web model.

Secondary consumer. Two feeding steps from producers.
What is a primary consumer in a food web?

An organism that eats producers (an herbivore). First level of consumers in the energy pyramid.
Identify the trophic level of a snake that eats rabbits in a food web model.

Secondary consumer. Eats herbivores, making it second-level consumer.
Identify the role of zooplankton that eats algae in a food web model.

Primary consumer. Herbivorous plankton are first-level consumers.
What is an apex predator in a food web model?

A top consumer with no predators in that web. Sits at the highest trophic level in its ecosystem.
What is an apex predator in a food web model?

A top consumer with no natural predators in that web. Sits at the top of the food web.
What is a decomposer in an ecosystem model?

An organism that breaks down dead matter and recycles nutrients. Essential for nutrient cycling in ecosystems.
What is a primary consumer in a food web model?

An organism that eats producers (an herbivore). First-level consumers that get energy directly from producers.
Which direction should an arrow point: from predator to prey, or prey to predator?

Prey to predator. Energy flows from the eaten to the eater.
Identify the trophic level of a rabbit that eats grass in a food web model.

Primary consumer. Herbivores are always primary consumers.
Which organisms should be included in every complete food web model to show nutrient recycling?

Decomposers. Essential for showing complete nutrient cycling in ecosystems.
Identify the missing arrow direction: grass ___ rabbit (energy flow).

Grass → rabbit. Arrow shows energy flowing from grass to its consumer.
What is an herbivore in a food web model?

A consumer that eats producers. Plant-eating animals are primary consumers.
What does each arrow represent in a food web model?

Transfer of energy and matter from one organism to another. Shows who eats whom and energy flow direction.
Identify the arrow error: hawk → snake means the hawk provides energy to the snake. What is the correct arrow?

snake → hawk. Energy flows from prey (snake) to predator (hawk).
What is a decomposer in a food web?

An organism that breaks down dead matter and recycles nutrients. Returns nutrients to soil for producers to use.
Which relationship is shown by the link: frog eats insect in a food web?

Predation. One organism kills and consumes another for energy.
Find and correct the arrow error: hawk → mouse (intended energy transfer).

Correct: mouse → hawk. Arrow should point from prey (mouse) to predator (hawk).
What is a food web in an ecosystem model?

A model showing interconnected feeding relationships among many organisms. Shows multiple feeding connections, unlike single-path food chains.
What is an apex predator in a food web model?

A top consumer with no natural predators in that web. Sits at the highest trophic level in its ecosystem.
What is a detritivore in a food web model?

An organism that eats dead organic matter (detritus). Feeds on dead material, not living organisms.
What is a secondary consumer in a food web?

A consumer that eats primary consumers. Second-level consumers are typically carnivores.
What is an omnivore in a food web?

A consumer that eats both producers and consumers. Has a varied diet across trophic levels.
What is the difference between a food chain and a food web?

A chain is one path; a web shows many interconnected paths. Webs are more realistic, showing organisms eat multiple foods.
What is the correct direction for arrows in a food web?

From food source to consumer (direction of energy transfer). Arrows point to the organism receiving the energy.

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