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Ninth Grade (Grade 9) Ecology Questions

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Grade 9 :: Ecology by PMISIAS
Which of these factors increases the size of a population?
  1. birthrate
  2. emigration
  3. death rate
  4. carrying capacity
Grade 9 :: Ecology by mrsbateacher
In the nitrogen cycle, nitrogen is fixed by
  1. nitrogen-fixing bacteria
  2. lightning
  3. a only
  4. a and b
  5. none of the above
Grade 9 :: Ecology by sbeck
Grade 9 :: Ecology by PMISIAS
All of the following are density dependent factors EXCEPT
  1. Competition
  2. Predation
  3. Commensalism
  4. Parasitism and disease
Grade 9 :: Ecology by TeacherClara
Grade 9 :: Ecology by der1228
Grade 9 :: Ecology by der1228
Organisms in the lowest trophic level of an ecosystem are always
  1. herbivores
  2. carnivores
  3. heterotrophs
  4. autotrophs
Grade 9 :: Ecology by TeacherClara
Which of the following is NOT an abiotic factor:
  1. moisture
  2. air currents
  3. predators
  4. temperature
  5. light
Grade 9 :: Ecology by chowe
The loss of a natural habitat is called:
  1. poaching
  2. habitat destruction
  3. habitat fragmentation
  4. pollution
Grade 9 :: Ecology by chowe
A species that influences the survival of many other species in an ecosystem is called a(an)
  1. endangered species
  2. keystone species
  3. niche species
  4. extinct species
Grade 9 :: Ecology by TeacherClara
When an organism reacts to a change in the environment, it is called
  1. a stimulus
  2. a response to stimulus
  3. growth
  4. development
  5. reproduction
Grade 9 :: Ecology by sbeck
What is a biosphere?
  1. Any individual living thing
  2. All organisms and the parts of earth where they exist
  3. A chemical process
Grade 9 :: Ecology by chowe
If fish are caught faster than they can breed, the population will
  1. decrease
  2. move to other waters
  3. remain the same
  4. increase
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