Ecosystems and Ecological Relationsips

What would most likely happen in the ecosystem shown in the food web if the fox population significantly increased?

• The population of bees would increase.

• The population of mice would increase.

• The population of black bears would increase.

• The population of mice would decrease.

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The food web shows the feeding relationships of six different populations in an ecosystem. Which populations compete with one another for food?

• mouse and spider

• sparrow and snake

• mouse and grasshopper

• snake and grasshopper

• spider and sparrow

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NGSS.MS-LS2-2

The food web shows the flow of energy through a terrestrial ecosystem. Which of the organisms shown in the food web is a predator of deer?

• rabbit

• plant

• fox

• owl

• chipmunk

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A dodder plant wraps itself around the stem of a clover plant, seriously damaging the clover. Small root-like structures from the dodder allow it to gain nutrients and water from the clover. Which type of relationship does this represent?

• mutualism

• commensalism

• competition

• parasitism

Rabbits and sheep both graze on shrubs, grasses, and other plants. The sharp rise in the population of rabbits in a region may result in a shortage of plants for sheep to graze upon. This relationship between sheep and rabbits is an example of _________.

• commensalism

• predation

• parasitism

• competition

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As a bee feeds upon the nectar produced by a flower, the bee may become coated with the flower's pollen. As the bee flies from flower to flower, some of this pollen may contact a flower's pistil, resulting in pollination.

This relationship between the bee and the flower is an example of _________.

• commensalism

• mutualism

• parasitism

• competition

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Consider the energy pyramid.

Why are there very few organisms toward the top of the pyramid?

• There is much less energy available at the top of the pyramid.

• There is too much energy available at the top of the pyramid.

• Organisms at the top of the pyramid can only generate energy directly from the sun.

• Organisms at the top of the pyramid are preyed upon by many other organisms.

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Food webs are models that show how energy flows in an ecosystem. What is the ultimate source of energy for all of the organisms in the food web shown above?

• consumers

• the sun

• decomposers

• producers

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Which statement is most correct about the collapse of the ocean food web that may be caused by the loss of an organism in the ecosystem?

• The loss of the large fish would mean that there would not be a need for the anchovies as a food source.

• The loss of the zooplankton would mean that there would not be a direct food source for the phytoplankton.

• The loss of the anchovies would mean that larger fish would not have enough food to thrive in that region.

• The loss of the phytoplankton would mean that the anchovy would not have phytoplankton as a direct food source.

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Which of the following statements is true according to the food web shown?

• Energy flows directly from the sun to consumers.

• Energy flows from producers and consumers to decomposers.

• Energy flows from consumers to decomposers and from decomposers to consumers.

• Energy flows from producers, consumers, and decomposers to the sun.

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