Test 8.L.3.1 - Reviewer

What happens to a population and to competition when there is a reduction of living space?

• The population expands and competition intensifies.

• Competition strengthens while the population contracts.

• The population increases as competition decreases.

• Competition weakens and the population decreases.

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If wolves prey on deer for food, what will most likely happen to the deer population if wolves are removed from an area where deer live?

• The population of deer will increase.

• The population of deer will decrease.

• The population of deer will remain the same.

• The population of deer will become extinct.

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Which best determines the number of wolves that can live in an area?

• the amount of snow in the area each year

• the number of birds that live in the area

• the number of trees in the area

• the amount of food available in the area

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Which best explains the relationship between the human and fox populations in the ecosystem?

• Humans compete for the same prey as foxes, causing the fox population to drop.

• Humans compete for the same space as foxes, causing the fox population to drop.

• Humans are affected by the same diseases as foxes, causing both populations to change in the same way.

• Humans are affected by the same predators as foxes, causing both populations to change in the same way.

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The graph below shows the relationship between available space in an ecosystem and a population of rabbits. How would the rabbit population be affected if land was cleared to build a housing development?

• The rabbit population would increase.

• The rabbit population would decrease.

• The rabbit population would remain stable.

• The rabbit population would rise temporarily, then fall.

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A forest food web includes rodents, snakes, and great horned owls. Snakes eat rats. Great horned owls eat mice and snakes. How will the owls most likely be affected by a sudden sharp increase in local populations of rodents?

• The owl population will either stabilize or increase.

• The owl population will migrate to another area.

• The owls will have to find another food source or risk starvation.

• Owls will have to compete more with each other for available food.

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An experiment is set up in 3 sealed test tubes. The contents of each tube are shown in the table below.

After 3 days, the snail in test tube 2 is dead, but the snail in test tube 3 is still alive. Which best explains this?

• The snail in test tube 3 had a limited food source.

• The snail in test tube 2 did not have an adequate water supply.

• The snail in test tube 3 was provided with oxygen by the Elodea.

• The snail in test tube 2 did not find the carbon dioxide it needed to create food.

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The diagram below shows the food web of a forest ecosystem.

• frog

• grass

• robin

• snake

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An experiment was conducted to test the effect of food availability and habitat space on a species of zooplankton. A sample of 500,000 zooplankton was placed into one of four tanks. A 100 L and 50 L tank were both provided with 15 mg of food daily. The other 100 L and 50 L tanks were provided with 30 mg of food daily. According to the graph, which variable has the greatest effect on population size?

• size of tank

• species of zooplankton

• amount of water in tank

• amount of food provided

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Which would a drought most likely affect?

• all organisms in a particular ecosystem

• only the plants in a particular ecosystem

• only the animals in a particular ecosystem

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