Food Chains and Food Webs Quiz
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Questions and Answers

What is the primary reason why there are fewer organisms at higher trophic levels?

  • The energy transfer between trophic levels is only 10% efficient. (correct)
  • Organisms at higher trophic levels reproduce more slowly.
  • Organisms at higher trophic levels require more food.
  • Organisms at higher trophic levels are more likely to be preyed upon.

    • Which trophic level stores the most energy?

  • Tertiary consumers
  • Primary producers (correct)
  • Secondary consumers
  • Primary consumers

    • Why are decomposers typically not shown in food webs?

  • Decomposers are too small to be represented.
  • Decomposers consume organisms from all trophic levels, so their arrows would point everywhere. (correct)
  • Decomposers are not important to the ecosystem.
  • Decomposers are not considered a part of the food chain.

    • What is the difference between a food chain and a food web?

    <p>Food webs are more complex and show interconnected relationships.</p> Signup and view all the answers

    What would likely happen if all the wolves were removed from an ecosystem?

    <p>The population of deer would increase.</p> Signup and view all the answers

    How do invasive species affect food webs?

    <p>Invasive species often compete with native species for resources.</p> Signup and view all the answers

    What is the difference between a primary consumer and a secondary consumer?

    <p>Primary consumers eat producers, while secondary consumers eat other consumers.</p> Signup and view all the answers

    Which of these is NOT a characteristic of a food web?

    <p>It is a simplified representation of the ecosystem.</p> Signup and view all the answers

    Which of the following organisms are considered consumers?

    <p>Panda</p> Signup and view all the answers

    What role do producers play in an ecosystem?

    <p>They perform photosynthesis to make their own food.</p> Signup and view all the answers

    What type of organism is a panda classified as?

    <p>Herbivore</p> Signup and view all the answers

    Which of the following statements accurately describes decomposers?

    <p>They are organisms that feed on organic matter.</p> Signup and view all the answers

    In a food chain, what do the arrows represent?

    <p>The direction of energy flow.</p> Signup and view all the answers

    Which example represents a scavenger?

    <p>Vulture</p> Signup and view all the answers

    What is the primary function of herbivores in a food chain?

    <p>To consume plants and convert them into energy.</p> Signup and view all the answers

    Removing a primary consumer from a food web would likely result in what?

    <p>An increase in the population of producers.</p> Signup and view all the answers

    Study Notes

    Food Chains and Food Webs

    • Food chains and food webs illustrate feeding relationships in ecosystems
    • Food chains: show a simple linear path of who eats whom
    • Food webs: show more complex and interconnected feeding relationships (multiple food chains)

    Learning Goals

    • Build food webs and food chains
    • Identify the trophic level of an organism (its position in a food chain)
    • Determine how removing or adding an organism affects the food web

    Consumers

    • Consumers obtain energy by consuming other organisms
    • Examples: white-tailed deer, spiny softshell turtle, green heron

    Producers

    • Producers create their own food through photosynthesis
    • Examples: sugar maple tree, moss, ostrich fern

    Decomposers/Detritivores

    • Decomposers/Detritivores break down organic matter (dead organisms/waste)
    • Examples: chicken of the woods fungi, lichen, worms, insects, bacteria

    Photosynthesis

    • CO2 + H2O → C6H12O6 + O2
    • Producers use sunlight to convert carbon dioxide and water into glucose (food) and oxygen

    Consumers/Heterotrophs

    • Organisms that obtain energy from other organisms
    • Herbivores: only eat plants/producers
      • Examples: panda, giraffe, rabbit
    • Carnivores: only eat animals
      • Examples: lion, lynx
    • Omnivores: eat both plants and animals
      • Examples: humans, dogs
    • Scavengers: eat remains of dead organisms
      • Examples: vultures

    Trophic Levels

    • Trophic levels describe feeding positions in a food chain
    • Organisms are classified according to their feeding level compared to the producers
    • Trophic level changes depending on food sources/predators

    Arrows in Food Chains/Webs

    • Arrows in food chains and webs point towards the organism that eats
    • Arrows represent energy flow

    The 10% Rule

    • Each trophic level only transfers 10% of energy to the next level
    • Limits the number of trophic levels an ecosystem can support
    • More organisms at lower trophic levels because of energy transfer limits

    Role of Decomposers

    • Decomposers/Detritivores are crucial for breaking down organic material
    • Food webs typically don't explicitly include decomposers but are essential for nutrient cycling

    Food Webs

    • Food chains are simplified models, not found in nature
    • Food webs show interconnected food chains in an ecosystem exhibiting more accurate feeding relationships
    • Food webs are useful for studying the impacts of removing or adding species

    What is a Food Web?

    • A food web represents all the interconnected food chains in an ecosystem
    • It reveals the feeding relationships between all living organisms
    • Useful tools for studying impacts of changes in an ecosystem (removal/addition of species)

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    Related Documents

    Food Chains and Food Webs PDF

    Description

    Test your knowledge of food chains and food webs in ecosystems. This quiz will help you understand the relationships between producers, consumers, and decomposers, as well as the impact of removing or adding organisms. Engage with the concepts of trophic levels and photosynthesis.

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