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Ninth Grade (Grade 9) Ecology Questions

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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
Grade 9 Communities, Populations, and Ecosystems
The number of births, deaths, and individuals that enter or leave a town are three factors that can affect                .
  1. geographics
  2. immigration
  3. population size
  4. range
Grade 9 Communities, Populations, and Ecosystems
A limiting factor that depends on population size is a                                  .
  1. size limiting factor
  2. prediction limiting factor
  3. completion limiting factor
  4. density-dependent limiting factor
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 Conservation and Biodiversity
The loss of a natural habitat, often also resulting in a loss of biodiversity, is                      .
  1. poaching
  2. habitat destruction
  3. habitat fragmentation
  4. pollution
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 Conservation and Biodiversity
Biodiversity is the variety of life within an area.
  1. True
  2. False
Grade 9 Food Chains and Webs
Which kind of organisms have the greatest amount of potential energy?
  1. consumers
  2. producers
  3. herbivores
  4. carnivores
Grade 9 Food Chains and Webs
Plants are producers.
  1. True
  2. False
Grade 9 Biotic and Abiotic
A rodent population leaves an ecosystem because of decreased temperatures and increased rain. Which of the following best explains why the rodents left?
  1. an increase in predation
  2. a decrease in parasitism
  3. a change in biotic factors
  4. a change in abiotic factors
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 Food Chains and Webs
What is composed of several food chains in an ecosystem that intersect and depend on one another?
  1. niche
  2. feeding level
  3. energy pyramid
  4. food web
Grade 9 Biotic and Abiotic
All the living organisms in an environment are                .
  1. biology
  2. biotic factors
  3. biosphere
  4. population
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