Practice Quiz

MCAS Biology Practice - Question List

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91. High levels of carbon dioxide in the blood trigger which of the following responses in the body?
  1. an increase in the rate of digestion
  2. an increase in the rate of breathing
  3. a decrease in the speed of the pulse
  4. a decrease in the production of sweat
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92. In July, a student tested the soil in two plots and calculated the concentration of nitrogen compounds present in each plot. The student then planted 20 seedlings in the first plot and allowed them to grow. Nothing was planted in the second plot. The student tested the soil in both plots again after one month. The concentration of nitrogen compounds had decreased in the first plot but had remained the same in the second plot. Which of the following best explains the decrease in nitrogen compounds in the first plot?
  1. The nitrogen compounds had broken down into
    elements.
  2. The nitrogen compounds were absorbed by the seedlings for their growth.
  3. The nitrogen compounds escaped through air pockets created by the seedlings’ roots.
  4. The nitrogen compounds had evaporated because of the warm summer temperatures.
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93. In a population of moths, wing color became darker over time. Which of the following is the best evidence that the change in wing color was an evolutionary change?
  1. The size of the moth population changed.
  2. The average length of the moths’ dark wings increased.
  3. The number of eggs that females laid during each breeding season increased
  4. The frequencies of the alleles for dark wing color in the moth population changed.
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94. Leaves fall from deciduous trees in autumn. The carbon in these leaves is returned to the atmosphere through which of the following processes?
  1. condensation
  2. decomposition
  3. photosynthesis
  4. transpiration
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95. Which of the following statements best explains why geographic isolation can lead to speciation?
  1. Physical separation of populations reduces competition for each group.
  2. Physical separation of populations prevents interbreeding and mixing of gene pools.
  3. Physical separation of populations provides more space for each group’s size to increase.
  4. Physical separation of populations stresses the organisms and causes mutations in their genetic code.
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