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Topic: 8.11 Organisms and Environments (1)

Quiz by Texas Education Agency

Grade 8
Science (2017)
Texas Essential Knowledge and Skills (TEKS)

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Measures 3 skills from
Grade 8
Science (2017)
Texas Essential Knowledge and Skills (TEKS)


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14 questions
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  • Q1
    Wild Soay sheep live in a cold environment on a small Scottish island. The sheep used to be large because they gained extra weight during the summers in order to survive the harsh winters. A recent change in the island’s climate has caused grass to be available for a longer period each year, so survival conditions for the sheep have become less challenging. Researchers who study these sheep have most likely observed a decrease in the wild Soay’s —
    Question Image
    reproduction rates
    body temperature
    life expectancy
  • Q2
    The graph below shows the percent of seeds from two plant species that sprout when grown in water containing different amounts of salt. Which of the following best summarizes the effect of saltwater on these plant species?
    Question Image
    Species 1 can sprout only in freshwater, and Species 2 can sprout only in saltwater.
    Both species can sprout in freshwater and saltwater, but Species 2 can sprout in a higher salt concentration than Species 1.
    Species 1 can sprout only in water with a low salt concentration, but Species 2 is not affected by the salt concentration.
    Both species need salt in their water, but Species 2 needs more salt than Species 1.
  • Q3
    Which organisms in the food web shown above compete for the same food source in this environment?
    Question Image
    Hawks and frogs
    Grasshoppers and snakes
    Frogs and snakes
    Decomposers and grasses
  • Q4
    The Couch’s spadefoot lives in Texas and has the characteristics listed below. The Couch’s spadefoot is adapted to a certain type of environment. Which of these resources is most likely scarce in this environment?
    Question Image
  • Q5
    Some scientists studying aquatic plants notice that flooding often leads to a decrease in the rate of photosynthesis among aquatic plants. Flooding causes more sediment to be suspended in the water. The increased sediment concentration decreases the amount of light that reaches the plants. Why does a decreased rate of photosynthesis lead to a decrease in a plant population?
    Less water is available for absorption.
    Less soil is available for leaf development.
    Less energy is available for reproduction.
    Less tissue is available for plant growth.

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