Competition in an Ecosystem

Organism X feeds mainly on small fish, amphibians, and reptiles. With which organism is organism X most likely to compete?

• Great blue heron

• Mallard

• Pied-billed grebe

• Great egret

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The population of deer in a certain area is monitored over a period of six years. The data is represented in the graph provided. Which of the following is the most likely explanation for the change in population in 2009?

• Wild dogs, which prey on deer, were being hunted more than usual.

• Snowfall in the previous spring was higher than the yearly average.

• Humans introduced grazing animals that feed on the same plants as the deer.

• More insects that pollinate flowering plants move into the ecosystem.

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Plants compete for air, water, ________ within ecosystems.

• space, and sound

• sunlight, and wind

• space, and sunlight

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What is competition in an ecosystem?

• How all the living and nonliving things in an area interact.

• A single, self-contained living thing

• More than one individual or population that depends on the same limited resources.

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In a certain ecosystem, foxes and snakes prey on the same rabbits. What would INCREASE the competition between the foxes and snakes?

• increase in foxes and snakes

• A smaller habitat for the foxes, snakes, and rabbits

• A reduction (lfewer) rabbits in the ecosystem

• All of the above

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What are some examples of resources over which plants compete?

• space, water, and animals

• water, light , and space

• sugar, temperature and carbon dioxide

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Competition in an ecosystem occurs when

• animals get bored.

• more than one individual or population in an ecosystem relies (needs) the same limited resource.

• there is more than enough of a resources for every living organism.

• resources are unlimited.

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If a disease strikes the snake population in the food chain shown, what will be the initial effect on the populations of hawks and rabbits?

• The populations of hawks and rabbits will decrease.

• The populations of hawks and rabbits will increase.

• The population of hawks will increase. The population of rabbits will decrease.

• The population of hawks will decrease. The population of rabbits will increase.

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What is the primary factor that leads to competition in an ecosystem?

• Limited resources

• Abundant resources

• Stable climate

• Diverse species

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In a forest ecosystem, which of the following scenarios would likely lead to increased competition among deer?

• An increase in the number of predators

• A decrease in available food sources

• An increase in the number of water sources

• A decrease in the number of predators

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