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TEKS Grade 7 Science - 7.10.B Biodiversity

Quiz by Texas Education Agency

Grade 7
Science (2017)
Texas Essential Knowledge and Skills (TEKS)

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Measures 1 skill from
Grade 7
Science (2017)
Texas Essential Knowledge and Skills (TEKS)


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4 questions
Show answers
  • Q1
    Tropical rain forests have the greatest biodiversity of any type of land ecosystem. How does biodiversity contribute to the sustainability of an ecosystem?
    The presence of a variety of herbivore species that can feed on a large number of different producer species helps ensure abundant prey for predators in the ecosystem.
    All of the above
    The presence of more species with different adaptations makes it more likely that some organisms will survive an ecological disaster.
    Greater genetic variation within species makes it more likely that some individuals will survive a disease outbreak.
  • Q2
    Students in a science class visited four local ecosystems. The students observed the species present in each ecosystem and recorded their observations in the table. Based on these observations, which ecosystem is likely to be the least sustainable?
    Question Image
    Ecosystem 3, because it has few predators
    Ecosystem 4, because it supports many animals
    Ecosystem 1, because it has the fewest species
    Ecosystem 2, because it includes both aquatic and terrestrial species
  • Q3
    The food webs below model relationships among the organisms in two ecosystems. Which ecosystem would be more likely to survive if a disease killed the grasses?
    Question Image
    The forest ecosystem, because most of the animals can eat other organisms
    The forest ecosystem, because it has three top predators
    The grassland ecosystem, because it has many herbivores
    The grassland ecosystem, because several predators compete for food
  • Q4
    An ecosystem that is not sustainable can break down when a natural disaster occurs. This can lead to organisms in the ecosystem either leaving the area or dying off. Increased biodiversity results in a more sustainable ecosystem because —
    the transition area between two ecosystems is narrower
    there are fewer species to be affected by environmental stresses
    a greater number of plant species means that there is less barren land
    a greater variety of species present allows more organisms to adapt after changes occur

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