Ecology Unit Pre-assessment (Grade 8)

12 Questions | Total Attempts: 957

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8th Grade Quizzes & Trivia

Ecology Unit Pre-Assessment (Grade 8)


Questions and Answers
  • 1. 
    Termites are small insects that eat wood causing so much damage that they can eventually cause a house to fall down.  However, termites cannot make enzymes that digest cellulose, the main component in wood.  A small protozoan called Trichonympha sphaerica lives inside the termite’s gut and excretes enzymes to break down cellulose.  However, the protozoa itself cannot make the enzymes.  Instead, a species of bacteria that lives inside the protozoa produces the enzyme.  What type of relationships are described in this passage? (Standards 6.1f, 6.1g, 6.3a)
    • A. 

      Predator/Prey

    • B. 

      Consumer/Decomposer

    • C. 

      Parasitism

    • D. 

      Mutualism

    • E. 

      Commensalism

  • 2. 
    In the food web depicted below, which organism is the autotroph (Standards 1.1a, 1.1b, 1.1c, 6.1a)?
    • A. 

      Owl

    • B. 

      Hawk

    • C. 

      Tree

    • D. 

      Grasshopper

    • E. 

      Rabbit

  • 3. 
    What important biotic factor is missing from the food web (Standards 1.1b, 1.1c, 6.1a, 6.1g)?
    • A. 

      Water

    • B. 

      Decomposers

    • C. 

      Producers

    • D. 

      Consumers

    • E. 

      Sunlight

  • 4. 
    The process is best described as (Standards 6.3b, 6.3c):
    • A. 

      Ecological Succession

    • B. 

      An Energy Cycle

    • C. 

      Negative Feedback

    • D. 

      A Food Web

    • E. 

      Commensalism

  • 5. 
    Which of the following organisms could fit in the space labeled x in this food chain? (Standards 1.1a, 1.1b, 1.1c)   Grass → X → Snake → Puma
    • A. 

      Raptors or Eagles

    • B. 

      Mice

    • C. 

      Leaves

    • D. 

      Coyote

    • E. 

      Algae

  • 6. 
    Coyote, wolves, and other carnivores occasionally kill chickens, pigs, and cows that live on farms, although they mostly eat small mammals that live in the wild.  Farmers will frequently kill these predators to protect their livestock.  Which result is most likely to occur when the predator population decreases (Standard 6.1d, 6.1e)?
    • A. 

      Herbivores will exceed carrying capacity and begin eating crops.

    • B. 

      The amount of healthy livestock on the farm will double in size.

    • C. 

      More grasses and seeds will be available for livestock to consume.

    • D. 

      Decomposers will take the place of predators in the ecosystem.

    • E. 

      The amount of parasites infecting the predators will increase.

  • 7. 
    All life requires energy, carbon, oxygen, hydrogen, and nitrogen.  Which statement best describes how they are used in the biosphere? (Standards 6.1a, 6.1b)
    • A. 

      Energy is recycled but elements must be added from the outside.

    • B. 

      Elements are recycled, but energy must be added from the outside.

    • C. 

      Both energy and elements are recycled.

    • D. 

      Neither energy nor elements are recycled.

    • E. 

      The amount of elements and energy constantly increase.

  • 8. 
    The main source of energy for a wetlands ecosystem is (Standard 1.1b, 1.1e, 1.1f)
    • A. 

      Water

    • B. 

      Soil

    • C. 

      Plants

    • D. 

      Fish

    • E. 

      The Sun

  • 9. 
    What are the two major life processes that involve carbon and oxygen (Standards 6.1d, 6.1e)?
    • A. 

      Coal formation and photosynthesis

    • B. 

      Photosynthesis and respiration

    • C. 

      Fuel combustion and open burning

    • D. 

      Death and decay

    • E. 

      Nitrogen fixation and denitrification

  • 10. 
    Which term represents an indirect economic value of biodiversity?
    • A. 

      Food

    • B. 

      Clothing

    • C. 

      Flood Protection

    • D. 

      Medicines

    • E. 

      Fuel

  • 11. 
    Rate, on a scale of 1 – 4, 1 being the lowest and 4 being the highest, how much do you know about ecology?
  • 12. 
    Rate, on a scale of 1 – 4, 1 being the lowest and 4 being the highest, how interested you are in ecology?
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