Unit 6 Ecosystem review 2

What impact do sunlight and water have on an ecosystem?

• They limit the carrying capacity of the ecosystem.

• They decrease the number of diseases resulting from overpopulation.

• They increase habitat areas for new organisms entering the ecosystem.

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Which is the most significant limiting factor in a desert ecosystem?

• nutrients

• predators

• sunlight

• water

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An aquatic food web is shown above. If acid rain causes a decrease in the number of mayfly nymphs, which population will decrease the MOST in number?

• trout

• frogs

• birds

• snails

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Which MOST likely occurs in the area where the tree falls that helps the plants and shrubs grow taller?

• A decrease in competition for sunlight.

• A decrease in the amount of rainfall.

• An increase in herbivore population.

• An increase in soil formation.

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Which of the following is a biotic factor in an ecosystem?

• water

• a large rock

• grass

• temperature

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4. If an ecosystem depends on pine trees and all of those trees are cut down to build houses, what will probably happen?

• Some of the living things would be able to survive because there would be erosion.

• The living things would have to adapt to living around houses and fences

• Many of the living things would have to move to find new homes or die.

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Habitat availability increases for a population. How would the carrying capacity of the prey change?

• The carrying capacity would increase as more resources become available.

• Carrying capacity occurs independent of factors in the environment.

• The carrying capacity would decrease as more resources became available.

• The carrying capacity is set in an environment and cannot change.

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An organism that gets energy by breaking down the remains of dead organisms and the wastes of living organisms

• autotrophs

• decomposers

• producers

• consumers

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Fleas harm cats and dogs by living off their blood. Which type of relationship is this?

• Cooperation

• Mutualism

• Parasitism

• Predator/Prey

Which best represents a mutualistic relationship?

• A lion lies in the tall grass watching a herd of gazelles.

• Maggots feed on the decaying remains of a dead animal.

• Insects pollinate a flower while feeding on nectar in the flower.

• A tapeworm takes in digested nutrients in the intestines of a sheep.