7th Grade Unit 1 Review

Which of the following are biotic factors (more than one)

• Bacteria

• Fungi

• Tree

• Sunlight

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Which of the following are abiotic factors? (more than one)

• grass

• rainfall

• wind

• lion

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What is a substance or object in the environment that is needed by organisms called?

• population

• resource

• species

• organism

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What are members of the same species in an ecosystem called?

• population

• resource

• species

• organism

What is an individual plant, animals, or other living thing called?

• population

• resource

• species

• organism

What term describes the variety of different organisms found in an ecosystem?

• population
• biodiversity
• ecosystem services

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A physical disruption to an ecosystem occurred when a highway was built through a forest. Which of the following would provide evidence that the addition of a highway to this forest affected populations?

• The amount of water runoff from higher elevations increased after the highway was built.

• The trees that were not cut down during the construction of the highway continued to grow.

• There were fewer species of nesting birds living in the forest after the highway was built.

• A greater area of the forest floor was exposed to the sunlight after the highway was built.

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A trout is a fish that lays its eggs in cold fresh water but spends some of its life in the ocean. Trout eat smaller fish. The graph shows the population of trout in Wisconsin between 1999 and 2014. Which change to the ecosystem had the largest effect on the population of trout in Wisconsin?

• A hard freeze of many of the lakes in Wisconsin in the winter of 2006

• The slow rise in lake temperatures in Wisconsin between 1999 and 2014

• The rise in population of smaller fish in Wisconsin lakes between 2010 and 2011

• A shift in ocean currents that occurred in 2000 and again in 2001

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What data would be most helpful to support the claim that the population of a certain plant is dependent on the rainfall in its habitat?

• The average amount of water absorbed by the roots and given off by the leaves of these plants

• The amount of water retained in the soil in the area where the plants live

• Rainfall amounts and number of these plants in a certain habitat over several years

• The heights and number of leaves produced by these plants under different moisture conditions

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An increase in the population of an organism would most likely be associated with which of the following?

• Severe weather in the habitat

• Decrease in available resources

• an expansion of suitable living space

• an increase in animals that prey on the organism

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