Practice Quiz

MCAS Biology Practice - Question List

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161. During the fall reproductive season, the belly of a male brook trout becomes bright orange. The orange belly provides some camouflage and helps attract females. This trait evolved in brook trout because, compared to males with pale bellies, males with bright orange bellies are more likely to
  1. live in good habitats.
  2. be eaten by predators.
  3. mate with other species of fi sh.
  4. fertilize eggs to produce offspring.
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162. Which of the following would most likely happen if grasses and shrubs were removed from a rural Massachusetts ecosystem?
  1. There would be an increase in consumers in the ecosystem.
  2. There would be an increase of photosynthesis in the ecosystem.
  3. There would be a decrease in food energy produced by the ecosystem.
  4. There would be a decrease of carbon dioxide available to the ecosystem.
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163. In one of the steps of the carbon cycle, a person exhales a molecule of carbon dioxide (CO2) into the atmosphere. Which of the following is most likely to happen next to the atom of carbon in this molecule?
  1. It may be used as part of a sugar in a plant.
  2. It may become part of a protein in an animal.
  3. It may be consumed as a fossil fuel is burned.
  4. It may be decomposed into carbon and oxygen by a bacterium.
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164. Which of the following is more likely to occur in a plant cell than in an animal cell?
  1. synthesis of enzymes
  2. formation of cellulose
  3. breakdown of glucose
  4. active transport of ions
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165. Which of the following correctly explains how atmospheric nitrogen is converted to nitrogen compounds used by living organisms?
  1. Sunlight converts atmospheric nitrogen to a form usable by protists.
  2. Plant leaves convert atmospheric nitrogen to a form usable by animals.
  3. Bacteria in soil convert atmospheric nitrogen to a form usable by plants.
  4. Invertebrate animals in soil convert atmospheric nitrogen to a form usable by fungi.
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