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Eighth Grade (Grade 8) Communities, Populations, and Ecosystems Questions

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Grade 8 Communities, Populations, and Ecosystems
What is the difference between an ecosystem and a biosphere?
  1. An ecosystem is all living and nonliving organisms in an area, and a biosphere is one plant or animal.
  2. An ecosystem is more than one organism that is the same species, and a biosphere is where all living things live.
  3. An ecosystem is all living organisms and nonliving things in an area, and a biosphere is where all living organisms and their surroundings are.
  4. An ecosystem is more than one organism of different species, and a biosphere is something that is eaten by another organism.
Grade 8 Communities, Populations, and Ecosystems
What is a biological indicator for an ecosystem?
  1. pH levels going up in a local pond
  2. turbidity levels going down in a river
  3. trout populations increasing in a local river
  4. soil nitrogen levels remaining steady
Grade 8 Communities, Populations, and Ecosystems
The larger a population gets, the faster it grows is called
  1. sample counts.
  2. exponential growth.
  3. limiting factor.
  4. carrying capacity.
Grade 8 Communities, Populations, and Ecosystems
You decide to raise fruit flies at home in two identical containers. You count the number of flies to compare the
  1. communities.
  2. ecosystems.
  3. limiting factors.
  4. populations.
Grade 8 Communities, Populations, and Ecosystems
All the organisms in a specific habitat comprise
  1. an ecosystem.
  2. a community.
  3. a population.
  4. the domain Eukarya.
Grade 8 Communities, Populations, and Ecosystems
The larger a population gets, the faster it grows is
  1. sample counts.
  2. exponential growth.
  3. limiting factor.
  4. carrying capacity.
Grade 8 Communities, Populations, and Ecosystems
A                   is a group of more than one species.
  1. population
  2. biosphere
  3. community
  4. carrying capacity
Grade 8 Communities, Populations, and Ecosystems
Which condition most likely results in a stable population size?
  1. more births than deaths
  2. more deaths than births
  3. no births
  4. number of births equals number of deaths
Grade 8 Communities, Populations, and Ecosystems
Which set includes the greatest number of limiting factors?
  1. food, water, shelter, space
  2. food, acid, trees, air
  3. food
  4. space
Grade 8 Communities, Populations, and Ecosystems
Which is an important natural cause of an ecosystem's population declining dramatically?
  1. air pollution
  2. strip mining
  3. pesticides
  4. disease
Grade 8 Communities, Populations, and Ecosystems
Two species of caterpillar are introduced into an ecosystem. Both species must eat the same kind of leaves from the same kind of tree in order to survive. Which situation is MOST likely to occur?
  1. Both species of caterpillar will thrive.
  2. One species will out-compete the other for leaves, and the other species will eventually die.
  3. One species will change its diet and begin eating leaves from another kind of tree.
  4. One species will begin to eat the other species.
Grade 8 Communities, Populations, and Ecosystems
What is true of matter in all ecosystems?
  1. It decreases as time goes on
  2. It is recycled
  3. It increases as time goes on
  4. none of the above
Grade 8 Communities, Populations, and Ecosystems
Which would BEST describe the niche of a minnow?
  1. lives in a pond
  2. lives with biotic factors of algae, larvae, grasses, and fish
  3. lives with biotic and abiotic factors
  4. lives in a pond where it eats algae and is eaten by larger fish
Grade 8 Communities, Populations, and Ecosystems
Which statement is true in a comparison of a community and a population?
  1. A community is a group of more than one species, and a population is where everything lives.
  2. A community is a group of more than one species, and a population is a group of one species.
  3. A community is how organisms interact, and a population is a group of the same species.
  4. A community is a group of more than one species, and a population is an organism that eats only meat.
Grade 8 Communities, Populations, and Ecosystems
Which scenario is an example of a population?
  1. eagles that live on a cliff
  2. river that runs through a canyon
  3. eagles, snakes, mice, grass, and bushes in a canyon
  4. eagles, snakes, mice, grass, bushes, and rocks in a canyon
Grade 8 Communities, Populations, and Ecosystems
Population can change only when members leave the population.
  1. True
  2. False
Grade 8 Communities, Populations, and Ecosystems
For which of these resources may organisms compete?
  1. food and space
  2. shelter and air
  3. space and rocks
  4. food and air
Grade 8 Communities, Populations, and Ecosystems
Which method is the BEST way to determine population size?
  1. direct observation
  2. indirect observation
  3. sampling
  4. mark and recapture
Grade 8 Communities, Populations, and Ecosystems
What is overproduction?
  1. the process by which the organisms that are best adapted to a specific environment survive and reproduce more offspring than organisms that are not as well adapted
  2. the normal differences found among offspring
  3. any trait that helps an organism survive and reproduce under a given set of environmental conditions
  4. the potential for a species to increase its numbers beyond the area’s carrying capacity
Grade 8 Communities, Populations, and Ecosystems
Intraspecific and interspecific are two types of competition.
  1. True
  2. False
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