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Ninth Grade (Grade 9) Ecology Questions

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Grade 9 Biotic and Abiotic
Which of the following situations show a biotic factor operating within an ecosystem?
  1. the kind of climate in a given region
  2. carnivores that eat other animals
  3. the concentration of hydrogen gas in the air
  4. the rate of water flow in a body of water
Grade 9 Biotic and Abiotic
A certain plant needs moisture, carbon dioxide, oxygen light, and minerals to survive. This scenario shows that a living organism depends on which of the following?
  1. abiotic factors
  2. biotic factors
  3. carnivore-herbivore relationships
  4. symbiotic relationships
Grade 9 Food Chains and Webs
Each step in a food chain or food web is represented by a(n)                    .
  1. biomass pyramid.
  2. ecological pyramid.
  3. energy pyramid.
  4. trophic level.
Grade 9 Communities, Populations, and Ecosystems
An ocean, a forest, and a grassy meadow are each examples of a complete                .
  1. biosphere
  2. community
  3. ecosystem
  4. population
Grade 9 Biogeochemical Cycles
Bacteria turn atmospheric nitrogen into a form of nitrogen usable by plants through the process of                  .
  1. bacteria fixation
  2. nitrogen fixation
  3. denitrogenation
  4. nitrogenation
Grade 9 Biotic and Abiotic
Living factors in an environment are called                .
  1. abiotic
  2. biomes
  3. biotic
  4. habitat
Grade 9 Food Chains and Webs
Which organisms can be found at the first, or lowest, trophic level?
  1. herbivores
  2. carnivores
  3. heterotrophs
  4. autotrophs
Grade 9 Food Chains and Webs
Herbivores eat only meat.
  1. True
  2. False
Grade 9 Symbiosis
A tapeworm feeds off the nutrients in your digestive tract, enriching itself at your expense. Why is this relationship is an example of parasitism?
  1. One organism benefits while another is harmed.
  2. One organism benefits while another is unaffected.
  3. Both organisms benefit.
  4. None of the organisms benefit or harmed.
Grade 9 Biomes
The two biomes with the least amount of precipitation are                                .
  1. tundra and taiga.
  2. taiga and desert.
  3. desert and tundra.
  4. tundra and temperate grassland.
Grade 9 Biotic and Abiotic
How are biotic and abiotic factors related?
  1. They are not related and do not interact.
  2. Abiotic factors are stronger than biotic factors.
  3. Biotic factors are stronger than Abiotic factors.
  4. Abiotic and biotic factors affect and influence each other constantly.
Grade 9 Communities, Populations, and Ecosystems
What term describes organisms of the same species inhabiting a particular region?
  1. biosphere
  2. ecosystem
  3. population
  4. environment
Grade 9 Communities, Populations, and Ecosystems
Every member of the same species that inhabits a region makes up a
  1. community.
  2. habitat.
  3. ecosystem.
  4. population.
Grade 9 Conservation and Biodiversity
Which description characterizes a stable ecosystem?
  1. one type of organism
  2. two types of organisms
  3. at least one type of plant and one type of animal
  4. a wide variety of organisms
Grade 9 Communities, Populations, and Ecosystems
A stable ecosystem is made up of a wide range of microorganisms, plants, and animals.
  1. True
  2. False
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