Ecosystems

Which pair of organisms shown are decomposers?

Which best describes the exchange of energy between the organisms?

Which is an abiotic factor that would affect the growth of a population within an ecosystem?

What is the primary source of energy for producers?

Which mechanism helps carbon to cycle from the atmosphere to living organisms?

Which best explains the role of plants in the carbon cycle?

Which demonstrates cooperation within an ecosystem?

Which organism will use energy to transform atmospheric nitrogen into a more usable form?

Which statement best explains the flow of energy as it moves through the different levels?

The organisms labeled A are most likely

Which would happen to a population of owls if their food source of field mice were eliminated?

Which best explains how plants contribute to the water cycle?

Which would be negatively affected by an increase in the beetle population?

Which limiting factor most affects the population growth of plants in a garden?

Which interaction between animals best controls the population of a species?

Which shows the correct flow of energy through this simple food chain?

Which best represents competition among species in an ecosystem?

Through which process do organisms release carbon dioxide into the atmosphere?

What is the role of decomposers?

Which statement describes how energy flows in the pyramid?

Which organism is most likely to compete with a rabbit for resources?

Which group in a food web changes atmospheric nitrogen into forms that are usable?

Which statement accurately describes an interaction between plants and animals?

The relationship between an owl and a mouse is a

Which is an example of how changes to abiotic factors can impact biotic factors?

Which best describes the role of krill in this food chain?

Which is the best example of predation in an ecosystem?

What describes the effect of removing shelter while increasing a population?

What type of relationship exists between wolves who hunt together for food?

Which is needed by all organisms to survive?

What describes the reaction of a new population to an increase in space?

Which level would be negatively affected initially if the secondary consumers were removed?

How would the rabbit population be affected if land was cleared to build a housing development?

Which best explains the role of bacteria in an ecosystem?

Which organisms are responsible for recycling nutrients from other decaying organisms?

A grassland experiences a drought. What will happen to the ecosystem?

Which type of organism would most likely benefit directly from increased levels of CO₂?

When space is limited in an ecosystem, how is a bird population most likely affected?

Which best represents a parasite and a host?

How does the energy in each trophic level compare to the energy in the preceding level?

When there is a lack of rain in a grassland ecosystem what will increase?

Which relationship from the table is parasitic?

A food web includes rats, snakes, & owls. How will the owls be affected by an increase in rats?

What is the effect on another population if nearly all of the mice are removed?

From what source does most of the energy in an ecosystem come?

Which is the best term to describe organisms living together in their ecosystem?

Which does every organism in an ecosystem need for survival?

Which relationship best demonstrates cooperation between species?

When would water be a limiting factor in an ecosystem?

If deer were introduced into this ecosystem, which would most likely occur first?

In which process is nitrogen from the air put into a form that plants can use?