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NCSCOS Grade 8 Life Science - 8.L.3 Diagnostic Ecosystems

Quiz by NCDPI

Grade 8
Science
North Carolina Standard Course of Study

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10 questions
Show answers
  • Q1
    Scientists discover that chemicals dumped in a river have caused trout, a type of fish, to die. What other living things will be MOST affected by the trout dying?
    bears that eat the trout
    plants that live at the edge of the river
    fishermen that catch the trout
    animals that drink the water
    30s
    8.L.3.1
  • Q2
    The hydrilla plant was introduced to freshwater habitats, like ponds and streams, in Georgia. Scientists found out that it crowds out the other water plants. It also uses up oxygen needed by other organisms living in the water. What MOST LIKELY happens when the hydrilla plants increase in a body of water?
    Young fish get more food to eat.
    Small fish get more hiding space from bigger fish.
    Other water organisms begin to die.
    Fish lay more eggs in the hydrilla.
    30s
    8.L.3.1
  • Q3
    Many chemicals are used to kill insects and protect plants. How could the removal of insects upset the balance of the ecosystem?
    Animals that eat the insects would die as well.
    The animals in the ecosystem would eat all the plants.
    Insects from other regions would replace the killed insects.
    The plants would rapidly decrease in number.
    30s
    8.L.3.1
  • Q4
    In the hills of North Carolina, several different species of wrens live in one large pine tree. This is possible because the wrens
    have different natural enemies.
    must have the resource competition from the other wren species.
    breed at different times.
    eat different foods found in and on the tree.
    30s
    8.L.3.2
  • Q5
    If the bald eagle was removed from this food web, what effect would this have on the population of the other species?
    Question Image
    The tundra swans would decrease in population size because they are eaten by the bald eagle and the vegetation would increase in population size.
    The wading birds would increase in population size because they are eaten by the ospreys and the small planktivorous fish would increase in population size.
    The bivalves would increase in population size because they are eaten by sea ducks and the phytoplankton would decrease in population size.
    The benthic invertebrates would decrease in population size because they are eaten by the sea ducks and the phytoplankton would increase in population size
    30s
    8.L.3.2
  • Q6
    Which BEST determines the number of wolves that can live in an area?
    The amount of food available in the area
    the number of trees in the area
    the number of birds that live in the area
    the amount of snow in the area each year
    30s
    8.L.3.1
  • Q7
    Kudzu vines grow by climbing and wrapping around trees. Trees covered by kudzu can die because they are starved of sunlight. What type of relationship exists between the trees and the kudzu growing on them?
    competition
    predator-prey
    parasitism
    mutualism
    30s
    8.L.3.2
  • Q8
    Consider this food web: Where is the largest amount of energy found in this food web?
    Question Image
    hawk
    grass
    grasshopper
    mouse
    30s
    8.L.3.3
  • Q9
    Which BEST explains the importance of nitrogen in the cycling of energy and matter?
    Nitrogen increases protein production in plants.
    Nitrogen decreases the effectiveness of photosynthesis.
    Nitrogen increases the effectiveness of photosynthesis.
    Nitrogen decreases protein production in plants.
    30s
    8.L.3.3
  • Q10
    The two main processes by which plant cells absorb, release, and use energy are
    photosynthesis and respiration.
    fermentation and respiration.
    aerobic and anaerobic respiration.
    digestion and photosynthesis.
    30s
    8.L.3.3

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