Science 8 STAAR Review: Organisms and their Environment Quiz

Which of the following are lists are examples of only abiotic factors?

• Water, air, mouse, mushroom

• Snake, mouse, owl

• Decomposers feasting on a deceased animal

• Soil, sunlight, rock

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Which of the following is true about abiotic factors?

• They are a good food source for producers.

• There will always be an abundant amount of every abiotic factor in each habitat.

• Abiotic factors aren’t alive, but are crucial (important) to things that are.

• Abiotic factors used to be alive, but aren’t anymore.

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Which organism has the most things competing for it?

• Tree

• Grasshopper

• Shrub

• Grass

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Which of the following is true about food webs?

• The arrows point to the prey.

• The arrows show the direction of energy flow.

• There are more species of producers in a food web than consumers.

• Each ecosystem can only involve organisms that are a part of the same food web.

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Which of the following is NOT an adaptation for the polar bear?

• White fur to blend with the snow and ice.

• Thick skin to help insulate from the cold.

• Large paws to help him walk on ice.

• Being a carnivore.

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Which of the following would NOT occur if the arctic cod were removed from this food web?

• The harp seal would be unaffected.

• The capelin population would decrease.

• The harbor seal population would decrease.

• The arctic char has more food available.

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Which of the following is most likely to cause a change in the genetic traits in an isolated population of a ground-dwelling lizard species?

• The exposure of an individual lizard in the population to radiation that causes a mutation that is not passed on to its offspring.

• An unusually dry summer in the lizard population's ecosystem.

• The introduction of an invasive predator tht preys on the brightest-colored individuals in the lizard population.

• A fast-moving wildfire that burns the naopy of the trees in the lizard population's ecosystem.

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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?

• The bacteria competed for nutrients and died after all the nutrients were consumed.

• The bacteria did not reproduced in the system, and eventually each indivudual died at the end of its cycle.

• The bacteria mutated from photosynthetic to carnivorious organisms and consumed one another until all the individuals were dead.

• The bacteria became diseased and were uable to survive in the closed system.

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