Practice Quiz

NAEP Science Grade 12 - Question List

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206.
There is less biomass at higher trophic levels of an ecosystem because at the higher trophic levels:
  1. Biodiversity is lower.
  2. Less energy is available.
  3. Decomposers are dominant.
  4. Toxic compounds accumulate.
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207.
Which of the following best explains why wildflowers on the forest floor in temperate deciduous forests often bloom between late March and early May in Massachusetts?
  1. Higher temperatures are more prevalent later in the summer.
  2. Pollinators are more available in early spring.
  3. Light is a limiting factor later in the summer.
  4. Fewer insect herbivores are active in the early spring.
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208.
The phosphorus cycle differs from the carbon and nitrogen cycles in that phosphorus is:
  1. In the same chemical form throughout its cycle.
  2. Not produced as a result of human activities.
  3. Not in a gas phase during any part of its cycle.
  4. Rarely a limiting factor in ecosystems.
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209.
Which of the following statements about the carbon cycle is accurate?
  1. Decomposers and other heterotrophs absorb carbon dioxide from the atmosphere during respiration.
  2. Historically, calcium carbonate from dead organisms has been a primary reservoir of carbon stored in ocean sediments.
  3. The main source of carbon dioxide returning to the atmosphere is the respiration of terrestrial consumers from the higher trophic levels.
  4. More carbon dioxide is absorbed by an acre of living trees in a year than is released by an acre of trees burning during a fire.
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210.
The use of phosphate-free detergents has been very effective in cleaning up lakes and rivers. This is because in freshwater ecosystems phosphorus:
  1. Presents osmoregulatory difficulties for zooplankton.
  2. Lowers the pH as a result of increased carbon dioxide levels.
  3. Accumulates in the brown fatty tissues of fish.
  4. Is the limiting nutrient for algal growth.
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