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TEKS Grade 8 Science - 8.11.A Competing for Biotic and Abiotic Factors

Quiz by Texas Education Agency

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

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


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15 questions
Show answers
  • Q1
    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?
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    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.
  • Q2
    Which organisms in the food web shown above compete for the same food source in this environment?
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    Hawks and frogs
    Grasshoppers and snakes
    Frogs and snakes
    Decomposers and grasses
  • Q3
    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?
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  • Q4
    The graph below shows the range of water conditions preferred by three species of fish in an Ozark stream. Water with which of these conditions would cause the most competition for resources among all three species of fish?
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    Mild temperatures, some suspended particles, flows at a medium speed
    Very cold, very clear, and very fast
    Mild temperatures, some suspended particles, flows very fast
    Very warm, very clear, and very slow
  • Q5
    Barnacles are marine organisms that live attached to surfaces as adults. A scientist studies two barnacle species that live on rocks on a coast in Scotland. In some rocky areas Species A is found alone. In other rocky areas Species B is found alone. In still other rocky areas both species are found together. The diagram below shows the two barnacle species on rocks in their habitats. If Species B were removed from the rocky areas it shares with Species A, Species A would most likely inhabit —
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    Zone I only
    Zones I and II only
    Zones I, II, and III
    Zone III only
  • Q6
    A scientist added bacteria and a nutrient medium that could support the growth of the bacteria to a sterilized petri dish. No other materials were added. The graph models growth of the bacteria over time. Which of these most likely explains why the bacterial population stopped growing?
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    The bacteria mutated from photosynthetic to carnivorous organisms and consumed one another until all the individuals were dead.
    The bacteria competed for nutrients and died after all the nutrients were consumed.
    The bacteria became diseased and were unable to survive in the closed system.
    The bacteria did not reproduce in the system, and eventually each individual died at the end of its life cycle.
  • Q7
    The strangler fig is a vine that starts out as a seed in the tree canopy of the rain forest. It drops its roots down from the canopy to the forest floor. By sprouting in the rain-forest canopy, the strangler fig seedling is exposed to more —
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  • Q8
    The Prairies Region and the Cross Timbers are located in north-central Texas. The graph below shows information about eating habits of white-tailed deer in these regions. A Cross Timbers rancher is concerned about competition between the ranch animals and the deer. Based on the graph, which ranch animals compete for the most food with white-tailed deer?
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    Turkeys that eat seeds and fruit
    Hogs that eat fruit, seeds, and feed
    Goats that eat weeds and shrubs
    Cattle that eat grass and feed
  • Q9
    A scientist named Joseph Connell studied two species of barnacles on the shore of a Scottish island. In the area between the average tide and the neap high tide, he found that the population of Species A was smaller than that of Species B. He removed Species B from one area but left both Species A and B in a similar area. The graph below shows the results of this study Based on these data, which hypothesis was Connell most likely testing?
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    The two species of barnacles are closely related to each other
    Barnacles grow larger when they are isolated from other species.
    The populations of both species of barnacles increase more in warm water than in cool water.
    The two species of barnacles compete with each other for resources.
  • Q10
    Fish in a lake have to compete for space. Different fish have different optimal temperature ranges. The graph below shows the temperature ranges of four fish species. At which temperature range will there be the most competition for space among these fish species?
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    10°C to 15°C
    15°C to 20°C
    25°C to 30°C
    5°C to 10°C
  • Q11
    Four students were asked to create a graph representing a typical predator–prey relationship. Which graph shows a situation in which the number of predators in a population depends on the number of prey?
  • Q12
    Black walnut trees produce a nontoxic chemical that becomes highly toxic when it is exposed to air or soil. How does this chemical help black walnut trees compete with plants growing nearby?
    By increasing the photosynthesis rates in the other plants
    By limiting the amount of water available to the other plants
    By attracting herbivores to the other plants
    By suppressing the growth of the other plants
  • Q13
    After researching the diets of several birds inhabiting a nearby pond, a student goes on a field investigation to observe the feeding habits of the birds. The student records information from research and observations in the table. The student observes a great blue heron catching fish near the edge of the pond. Based on the information the student collected, which bird will compete with the great blue heron for the same hunting spots and similar prey?
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    The mallard, because it hunts for fish while wading near the edge of the pond
    None of these
    The pied-billed grebe, because it dives in open water to get crayfish on the bottom of the pond
    The great egret, because it hunts in water near the edge of the pond for fish and other prey
  • Q14
    Which BEST determines the number of wolves that can live in an area?
    the number of birds that live in the area
    the amount of food available in the area
    the amount of snow in the area each year
    the number of trees in the area
  • Q15
    What happens to a population and to competition when there is a reduction of living space?
    Competition weakens and the population decreases.
    The population expands and competition intensifies.
    Competition strengthens while the population contracts.
    The population increases as competition decreases.

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