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Quizzes > Science

Producers, Consumers and Decomposers Quiz

Quick, free trophic levels quiz. Instant results.

Editorial: Review CompletedCreated By: Feray DadaliUpdated Aug 23, 2025
Difficulty: Moderate
2-5mins
Learning OutcomesCheat Sheet
Paper art style farm scene showing sun, plants, rabbit, fox, mushroom on dark blue background with food chain quiz title

This quiz helps you tell producers, consumers, and decomposers apart in real food chains, with instant feedback on each question. Explore how they connect in a broader network with our food web quiz, see how energy moves with the energy flow in ecosystems quiz, and practice transfers with the producer to consumer energy quiz.

Is a monkey a producer, consumer, or decomposer?
Predator
Decomposer
Producer
Consumer
Monkeys are animals that consume other organisms (plants and sometimes small animals) for energy, classifying them as consumers. They cannot photosynthesize like producers, nor do they break down dead material in the same way decomposers do. In ecological food chains, consumers depend on producers or other consumers for nutrition.
Green algae in a pond use photosynthesis to produce their own food. What category are they?
Scavenger
Decomposer
Producer
Consumer
Green algae contain chlorophyll and convert sunlight into chemical energy through photosynthesis, making them autotrophs. As autotrophic organisms, they synthesize organic compounds from carbon dioxide and water. This places them in the producer category at the base of the food chain.
Mushrooms growing on dead logs feed by breaking down organic matter. Which category does this describe?
Consumer
Parasite
Decomposer
Producer
Mushrooms are fungi that secrete enzymes to decompose dead organic material and absorb the resulting nutrients. By breaking down complex molecules into simpler substances, they recycle nutrients back into the ecosystem. This decomposition role classifies them as decomposers.
Grass performs photosynthesis to make its own food. Which food chain category does grass belong to?
Producer
Consumer
Herbivore
Decomposer
Grass contains chloroplasts that capture sunlight to produce sugars via photosynthesis, making it autotrophic. As an autotroph, grass is classified as a producer at the base of terrestrial food chains. Producers generate energy that supports all higher trophic levels.
A vulture feeds on dead animals but does not break down matter chemically. What is its classification in a food chain?
Scavenger
Producer
Decomposer
Consumer
Vultures feed on carrion without chemically decomposing it as decomposers do. They are consumers, more specifically scavengers, because they obtain energy by eating other organisms. Despite feeding on dead matter, they do not recycle nutrients in the same enzymatic way decomposers do.
Soil bacteria that break down organic waste in compost bins belong to which category?
Parasite
Producer
Consumer
Decomposer
Composting bacteria secrete enzymes that decompose dead plant and animal material into simpler compounds. This process recycles nutrients back into the soil. Their role in breaking down organic waste classifies them as decomposers.
Earthworms consume decaying leaves and organic debris. Which category do they fall into?
Decomposer
Scavenger
Producer
Consumer
Earthworms feed on dead organic matter and help break it down both physically and chemically in their digestive system. This process accelerates decomposition and nutrient cycling. In ecological terms, organisms that decompose dead material are classified as decomposers.
Phytoplankton use sunlight to produce food in marine ecosystems. What category are they?
Fungivore
Decomposer
Consumer
Producer
Phytoplankton contain chlorophyll and carry out photosynthesis, converting sunlight into organic compounds. They are primary producers in aquatic food webs, generating the energy base for marine ecosystems. Without them, higher trophic levels could not be sustained.
Hyenas that feed on carcasses rely on other organisms for energy. What category are they?
Parasite
Decomposer
Consumer
Producer
Hyenas eat meat from other animals and obtain energy by consuming organic matter. This makes them consumers in the food chain. They are often considered scavengers but still fall under the consumer category because they do not produce or chemically decompose energy sources.
Yeast breaks down sugars during fermentation. In ecological terms, what category does yeast represent?
Decomposer
Producer
Consumer
Parasite
Yeast is a fungus that secretes enzymes to decompose sugars into alcohol and carbon dioxide. In ecosystems, fungi that break down organic substrates are classified as decomposers. They play a crucial role in nutrient recycling.
Oak trees convert sunlight into chemical energy via photosynthesis. What are they classified as?
Herbivore
Producer
Decomposer
Consumer
Oak trees contain chloroplasts in their leaves that use sunlight to manufacture sugars. As autotrophs, they produce organic matter that serves as food for consumers. This autotrophic role places them in the producer category.
Paramecia feed on bacteria in freshwater. What is their classification in the food chain?
Consumer
Producer
Decomposer
Detritivore
Paramecia are single-celled protists that ingest bacteria and other small particles for nutrition. They depend on other organisms for energy, which classifies them as consumers in the aquatic food web. Their feeding helps regulate bacterial populations.
What trophic level does a rabbit occupy as it eats only plants?
Producer
Secondary consumer
Primary consumer
Decomposer
Rabbits feed directly on plants, placing them at the second trophic level as primary consumers. Primary consumers are herbivores that obtain energy by eating producers. They form an essential link between producers and higher-level consumers.
A fox preys on rabbits. Which consumer level describes the fox?
Primary consumer
Secondary consumer
Decomposer
Tertiary consumer
Foxes that eat herbivores such as rabbits occupy the third trophic level as secondary consumers. Secondary consumers consume primary consumers for energy. They are typically carnivores or omnivores that feed on herbivores.
An eagle eats snakes that have eaten rodents. What is the eagle's trophic level?
Quaternary consumer
Producer
Secondary consumer
Tertiary consumer
Eagles that prey on snakes (which are secondary consumers) occupy the fourth trophic level as tertiary consumers. Tertiary consumers feed on secondary consumers and are often near the top of the food chain. They help regulate populations of organisms at lower trophic levels.
What ecological role do fungi such as molds on bread play?
Producer
Consumer
Decomposer
Predator
Bread molds are fungi that secrete enzymes to break down complex carbohydrates into simpler compounds. This decomposition process recycles nutrients back into the environment. In ecology, organisms that decompose dead or decaying matter are classified as decomposers.
Which group of organisms is essential as producers in marine food webs?
Phytoplankton
Benthos
Nekton
Zooplankton
Phytoplankton are microscopic photosynthetic organisms that form the base of aquatic food chains. They convert sunlight into organic matter, supporting marine life from small zooplankton to large fish. Without them, higher trophic levels in the ocean could not be sustained.
Venus flytraps photosynthesize and also trap insects to digest. Which category best describes them?
Consumer
Decomposer
Both producer and consumer
Producer
Venus flytraps contain chlorophyll and perform photosynthesis like other plants, making them producers. They also trap and digest insects to obtain additional nutrients, which is a consumer behavior. This dual strategy classifies them as both producer and consumer.
Lichens are symbiotic complexes of fungi and algae. In a food chain, how are lichens primarily classified?
Both decomposer and producer
Producer
Decomposer
Consumer
Lichens consist of a fungal partner and a photosynthetic algal or cyanobacterial partner. The photosynthesizing partner produces organic compounds using sunlight, classifying the lichen overall as a producer. While the fungus benefits by receiving nutrients, it does not define the lichen's primary ecological role.
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Study Outcomes

  1. Identify Food Chain Roles -

    Understand the basic functions of producers, consumers, and decomposers within an ecosystem and how they contribute to the flow of energy.

  2. Differentiate Ecosystem Categories -

    Learn to distinguish producers from consumers and decomposers using clear definitions and examples.

  3. Classify a Monkey's Role -

    Determine whether a monkey is a producer, consumer, or decomposer based on its feeding behavior and ecological niche.

  4. Analyze Energy Flow -

    Explore how energy is transferred between organisms in a food chain and the importance of each ecological role.

  5. Apply Food Chain Vocabulary -

    Use essential terms like producer, consumer, and decomposer correctly in context to boost your food chain vocabulary.

  6. Reinforce Eco-Literacy -

    Engage with interactive quiz questions to solidify your understanding of food chain concepts and test your knowledge.

Cheat Sheet

  1. Producers and Photosynthesis -

    Producers, like green plants and algae, harness sunlight to convert carbon dioxide and water into glucose and oxygen via the formula 6CO₂ + 6H₂O → C₆H₝₂O₆ + 6O₂. Remember "Pitch Perfect Photosynthesis" as a fun mnemonic to recall the process of energy capture. This foundational step fuels every food chain, supplying energy to all other organisms (Britannica, 2023).

  2. Monkeys as Consumers -

    Monkeys are consumers because they rely on eating plants, fruits, insects and sometimes small animals to meet their energy needs, placing them at primary or secondary trophic levels. For example, the howler monkey primarily eats leaves (herbivore role), while capuchins add insects (omnivore role) to their diet - always consuming rather than producing or decomposing. This clearly shows that a monkey is a consumer, not a producer or decomposer (National Geographic, 2022).

  3. Decomposers Defined -

    Decomposers, like fungi and bacteria, break down dead organic matter into simpler compounds, recycling nutrients back into the ecosystem. Think "Nature's Recycling Team" to recall how decomposers close the loop by turning fallen leaves, dead animals, and waste into soil nutrients (US EPA, 2021). Monkeys don't play this role - they help spread seeds but don't chemically decompose material.

  4. Trophic Levels and Mnemonics -

    The concept of trophic levels ranks organisms by their energy source: producers at Level 1, primary consumers (herbivores) at Level 2, secondary consumers (omnivores/carnivores) at Level 3, and so on. Use the mnemonic "PEPSI" (Producers → Eaters → Predators → Soil recyclers → Infinity) to remember each level's order and function. Monkeys usually occupy Levels 2 - 3 depending on whether they're eating plants or animal prey (University of California, 2020).

  5. Food Chains vs. Food Webs -

    Food chains show a single linear energy flow from one producer through a set sequence of consumers, whereas food webs display complex interconnections among multiple chains. Monkeys often link fruit-bearing trees (producers) to apex predators like leopards, and their seed-dispersal role creates branching paths in a food web. Visualizing a web rather than a straight line helps illustrate how energy and nutrients cycle in real ecosystems (Smithsonian Institution, 2022).

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