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Ecosystems

Quiz by Ms. Foskey

Grade 7
Science
Louisiana Student Standards

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17 questions
Show answers
  • Q1
    What effect does the removal of a top predator in an ecosystem typically have on the populations of species lower in the food chain?
    Prey populations will remain unchanged.
    Prey populations will be eliminated completely.
    Prey populations will decrease due to competition.
    The populations of prey species may increase significantly due to reduced predation.
    30s
    7-MS-LS2-4
  • Q2
    How might a prolonged drought affect the plant and herbivore populations in a grassland ecosystem?
    Plant populations will increase, benefiting the herbivores.
    Plant populations may decrease, leading to a reduction in herbivore populations due to limited food availability.
    Herbivore populations may increase due to stress.
    Both plant and herbivore populations remain stable despite the drought.
    30s
    7-MS-LS2-4
  • Q3
    What impact might the introduction of a non-native plant species have on the native plant population in an ecosystem?
    Native plant populations will increase due to new resources.
    Non-native plants will have no effect on native plants.
    Native animal populations will immediately decline instead.
    The non-native plant may outcompete native plants for resources, leading to a decline in native plant populations.
    30s
    7-MS-LS2-4
  • Q4
    What is a likely consequence of deforestation on the animal populations in a forest ecosystem?
    Only predator populations will decline, while prey populations will increase.
    Animal populations may decline due to loss of habitat and food sources.
    Animal populations will not change significantly.
    Animal populations will increase due to more open space.
    30s
    7-MS-LS2-4
  • Q5
    How might an increase in herbivore populations affect plant composition in an ecosystem over time?
    All plant species will flourish equally.
    Herbivore populations will not impact plant growth at all.
    Plant diversity will increase due to more available space.
    Increased herbivory pressure can lead to a decline in certain plant species, especially those that are preferred by herbivores.
    30s
    7-MS-LS2-4
  • Q6
    What impact might a significant increase in human population and urbanization have on a local river ecosystem?
    There will be an increase in aquatic populations due to higher water temperatures.
    Aquatic plant life will proliferate, leading to clearer water.
    Increased pollution and habitat destruction may lead to a decline in aquatic populations.
    The ecosystem will remain stable despite urbanization.
    30s
    7-MS-LS2-4
  • Q7
    What effect does the introduction of an invasive fish species typically have on native fish populations in a freshwater ecosystem?
    Native fish populations will diversify and increase in richness.
    Invasive fish will have no effect on native populations.
    Native fish populations may decline due to competition for food and habitat resources.
    Native fish populations will increase to compete with the invasive species.
    30s
    7-MS-LS2-4
  • Q8
    How might a sudden decrease in temperature affect the population dynamics in a temperate forest ecosystem?
    The ecosystem will experience no change in species dynamics.
    All species will increase due to the temperature change.
    Cold-sensitive species may decline, while cold-tolerant species might increase their population.
    Only predator species will increase while prey species decline.
    30s
    7-MS-LS2-4
  • Q9
    What likely effect does the introduction of a disease have on the population of a keystone species in an ecosystem?
    The disease will lead to new keystone species emerging immediately.
    There will be no change, as the ecosystem compensates for the loss.
    Only predator populations will be affected, leaving other species unchanged.
    The population of the keystone species may drastically decline, affecting the entire ecosystem structure.
    30s
    7-MS-LS2-4
  • Q10
    What impact does nutrient pollution, such as from agricultural runoff, typically have on aquatic ecosystems?
    There is no significant impact on aquatic ecosystems from such pollution.
    It causes immediate extinction of all aquatic plant life.
    Nutrient pollution increases biodiversity and enhances aquatic life.
    It can lead to algal blooms, which deplete oxygen levels and harm aquatic life.
    30s
    7-MS-LS2-4
  • Q11
    What effect might an increase in water temperature have on the fish population in a coral reef ecosystem?
    It will cause no noticeable change in fish populations or coral health.
    It will make fish populations more diverse without affecting coral reefs.
    It may lead to coral bleaching and a decrease in fish populations due to habitat loss.
    It will result in an increase in fish populations as new temperatures attract other species.
    30s
    7-MS-LS2-4
  • Q12
    What could be the effect of introducing an invasive plant species to a grassland ecosystem?
    It could enhance nutrient cycling and improve soil fertility.
    It could lead to increased biodiversity by providing new habitats.
    It could have no significant impact on the existing plant and animal life.
    It could outcompete native plants, leading to a reduction in biodiversity.
    30s
    7-MS-LS2-4
  • Q13
    What effect would an increase in nutrient pollution in a pond ecosystem have on the population of algae?
    The algae population would likely increase significantly due to the excess nutrients.
    The algae population would remain the same despite the changes.
    The algae population would decrease due to competition for resources.
    The algae population would be completely replaced by other organisms.
    30s
    7-MS-LS2-4
  • Q14
    What effect does a decrease in the number of trees in a forest ecosystem have on the population of deer in that area?
    The deer population will remain unchanged.
    The deer population will increase as they look for food elsewhere.
    The deer population may decrease due to loss of habitat and food resources.
    The deer population will thrive due to less competition.
    30s
    7-MS-LS2-4
  • Q15
    How might the removal of a top predator, such as a wolf, from a forest ecosystem affect the populations of deer and vegetation?
    Both deer and vegetation populations will remain stable despite the change.
    The vegetation will become more abundant as deer migrate to avoid predators.
    The deer population will decrease dramatically due to lack of predation.
    The deer population may increase, leading to overgrazing and a decline in vegetation.
    30s
    7-MS-LS2-4

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