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Ninth Grade (Grade 9) Biotic and Abiotic 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 Biotic and Abiotic
Living factors in an environment are called                .
  1. abiotic
  2. biomes
  3. biotic
  4. habitat
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 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 Biotic and Abiotic
All the living organisms in an environment are                .
  1. biology
  2. biotic factors
  3. biosphere
  4. population
Grade 9 Biotic and Abiotic
What is a biosphere?
  1. any individual living thing
  2. all organisms and the parts of Earth where they exist
  3. a chemical process
  4. weather and climate
Grade 9 Biotic and Abiotic
What is an example of a biotic factor?
  1. air
  2. water
  3. grass
  4. soil
Grade 9 Biotic and Abiotic
A limiting factor that depends on population size is                    .
  1. niche-dependent
  2. density-dependent
  3. habitat-independent
  4. density-independent
Grade 9 Biotic and Abiotic
During a long period when there is no rainfall, a mountain lion may temporarily leave its usual hunting territory to drink from a farm pond. To what is this behavior probably due?
  1. its need to find different foods to eat
  2. the change in an abiotic factor in its environment
  3. its need to find a new habitat
  4. the change in a biotic factor in its environment
Grade 9 Biotic and Abiotic
Which of the following biotic factors might affect the life of water-dwelling organisms?
  1. pollutants in the water
  2. temperature of the water
  3. speed of the water current
  4. bacterial population in the water
Grade 9 Biotic and Abiotic
Which of these phrases describes the biotic factors of an ecosystem?
  1. two dissimilar organisms living together, as in mutualism, commensalism, amensalism, or parasitism
  2. any living part of an environment
  3. the number of individual organisms in each trophic level of an ecosystem
  4. an organism that eats only meat
Grade 9 Biotic and Abiotic
Which of these is an abiotic factor?
  1. Cloud cover over an area.
  2. Amount of algae in a pond.
  3. Introduction of new predators in an area.
  4. A virus that spreads among a population.
Grade 9 Biotic and Abiotic
Which of these phrases describes the abiotic factors of an ecosystem?
  1. an environmental factor that tends to limit population size
  2. the nonliving physical or chemical conditions of an environment
  3. a species that lived in one place but that has moved to a new geographic location because of human interference
  4. the complete process by which habitat loss results in the division of large, continuous habitats into a greater number of smaller patches of lower total area
Grade 9 Biotic and Abiotic
Which example shows a relationship between an abiotic and biotic factor in an ecosystem?
  1. An insect is food for a salmon.
  2. Water carries a rock downstream.
  3. A tree removes a gas from the air.
  4. A flower makes food for a butterfly.
Grade 9 Biotic and Abiotic
Which feature is an abiotic factor in an ecosystem?
  1. weather
  2. number of predators
  3. number of producers
  4. presence of decomposers
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