Animal Population

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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NGSS.MS-LS2-1

NGSS.MS-LS2-4

Hawks and brown bears live together in the same habitat. There will be competition between the hawks and the brown bears only if which of the following is true?

• Brown bears hibernate during the winter while hawks remain active.

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

• Both brown bears and hawks feed on the same species of fish.

• Both Shanna and Savanna feed on the same species of snakes.

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NGSS.MS-LS2-1

NGSS.MS-LS2-4

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 snowfall

• Overall size of 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 a faster rate.

• are both active during the night.

• have the different adaptations.

• require the same resources.

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NGSS.MS-LS2-1

In an ecosystem, what do organisms and populations with similar needs compete over?

• food

• water

• shelter

• all of the above

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NGSS.MS-LS2-1

NGSS.MS-LS2-4

The milkweed plant serves an important role in the life cycle of the monarch butterfly. Adult monarchs lay their eggs on milkweed, and then caterpillars eat that same plant during their development. Based on the relationship between monarchs and milkweed, which of the following trends would be predicted when looking at data on the populations of these two organisms?

• A decrease in the milkweed population will cause a decrease in the monarch butterfly population.

• When the milkweed population decreases, the monarch butterfly population stays the same.

• A decrease in the milkweed population will cause the monarch population to increase.

• When the monarch population increases, the milkweed population stays the same.

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

This diagram shows the variety of organisms that live in different tide zones. Mussels are common organisms that compete for space in intertidal (middle) tide zones. If all of the mussels were removed from zone A, which organisms would likely compete for the space in Zone A?

• Periwinkle and Limpets

• Sea lettuce and Chiton

• Sea urchins and Hermit crabs

• Rock louse and Periwinkle

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NGSS.MS-LS2-1

NGSS.MS-LS2-4

Animals from two different species utilize the same source of nutrition in one area. It is most accurate to say that the animals…

• will learn to get along

• will compete for food

• will die because there will not be enough food for both of them

• will learn to eat different foods

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NGSS.MS-LS2-1

NGSS.MS-LS2-4

What will happen if a factor that a species is dependent on decreases?

• The species will also decrease

• The species will increase

• nothing

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NGSS.MS-LS2-1

NGSS.MS-LS2-4

Relationship is when two living things "fight" for limited resources.

• Dependent

• Competitive

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NGSS.MS-LS2-1