1.1 Competition in Ecosystems

Eagles and grizzly bears live together in the same habitat. There will be competition between the eagles and the grizzly bears only if which of the following is true?

• Grizzly bears hibernate during the winter while eagles remain active.

• Pesticides in the fish population affect eagles’ eggs and decrease their population.

• Both grizzly bears and eagles feed on the same species of salmon.

• Laws prevent humans from being able to hunt eagles or grizzly bears.

An increase in which of the following factors is likely to contribute to competition between two members of the same species living in a certain habitat? 

• Available food resources

• Population of the species

• Annual rainfall

• Overall size of the habitat

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NGSS.MS-LS2-1

NGSS.MS-LS2-4

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?  

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

• Rainfall 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 habitat.

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NGSS.MS-LS2-1

NGSS.MS-LS2-4

A student wants to investigate competition between two organisms. For the investigation, it is most important that the student should choose organisms that–

• reproduce at the same rate.

• are both active during the day.

• have the same adaptations.

• require the same resources.

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NGSS.MS-LS2-1

Two species of fish live in the same pond. They eat the same kinds of plants. They are eaten by the same water birds. Which of the following would increase competition between these two species of fish?

• Average habitat temperature increases

• Population of water birds increases

• Number of food plants increases

• Water level in the pond decreases

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

An interaction between organisms that rely on the same resources​ (a)  

• ecosystem
• organism
• competition
• population
• resources

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NGSS.MS-LS2-4

A self-contained living thing

• organism

• ecosystem

• competition

• population

• resources

Source from which organisms benefit

• ecosystem

• organism

• competition

• population

• resources

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NGSS.MS-LS2-1

Two or more members of the same species living in the same habitat

• ecosystem

• organism

• competition

• population

• resources

The specific environment in which an organism lives

• ecosystem

• organism

• competition

• population

• resources

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NGSS.MS-LS4-4