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Ninth Grade (Grade 9) Ecology Questions

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Grade 9 Biotic and Abiotic
Which situation is 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 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 Conservation and Biodiversity
If fish reproduce at a slower rate than the rate at which they are caught, how will their population change?
  1. It will decrease.
  2. The fish will swim to other bodies of water.
  3. It will not change.
  4. It will increase dramatically.
Grade 9 Communities, Populations, and Ecosystems
The study of organisms' interactions with their surroundings is
  1. abiotic.
  2. ecology.
  3. sociology.
  4. microbiology.
  5. geology.
Grade 9 Biogeochemical Cycles
The recycling of chemical elements throughout an ecosystem is
  1. energy.
  2. a trophic level.
  3. the phosphorus cycle.
  4. the biogeochemical cycle.
Grade 9 Conservation and Biodiversity
A species that impacts the survival rates of other species in an ecosystem is a(n)
  1. endangered species.
  2. keystone species.
  3. niche species.
  4. extinct species.
Grade 9 Food Chains and Webs
Grade 9 Communities, Populations, and Ecosystems
Grade 9 Communities, Populations, and Ecosystems
Which is NOT considered to be a density-dependent factor?
  1. competition
  2. predation
  3. commensalism
  4. parasitism and disease
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
  1. biotic factors.
  2. abiotic factors.
  3. symbiotic relationships.
  4. carnivore-herbivore relationships.
Grade 9 Communities, Populations, and Ecosystems
Which of these factors increases the size of a population?
  1. birthrate
  2. emigration
  3. death rate
  4. carrying capacity
Grade 9 Biotic and Abiotic
All are considered to be abiotic factors EXCEPT
  1. moisture.
  2. air currents.
  3. predators.
  4. temperature.
  5. light.
Grade 9 Biogeochemical Cycles
Grade 9 Food Chains and Webs
Grade 9 Food Chains and Webs
What is the ultimate source of energy in any food chain?
  1. the sun
  2. producers
  3. consumers
  4. decomposers
Grade 9 Communities, Populations, and Ecosystems
Grade 9 Food Chains and Webs
Energy is lost from one organism to another as
  1. heat.
  2. waves.
  3. sound.
  4. dispersion.
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