2024-25 8th STAAR RC 4 Organisms & Environment Review

(a)   is a biotic factor in an ecosystem.

• Sunlight
• Soil
• Water
• Trees

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NGSS.MS-LS1-4

NGSS.MS-LS2-2

NGSS.MS-LS2-4

Which abiotic factor is essential for photosynthesis?

• Water

• Sunlight

• Soil

• Oxygen

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NGSS.MS-LS1-6

NGSS.MS-LS2-3

Which statement best describes competition among organisms?

• A. Organisms only compete for food.

• B. Organisms compete for both biotic and abiotic resources.

• C. Competition occurs only between different species.

• D. Competition happens only when food is scarce.

What would happen if a large amount of water was removed from an ecosystem?

• The population of plants and animals would increase.

• Organisms would compete more for the limited water supply.

• The ecosystem would not be affected.

• More biodiversity would be present.

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NGSS.MS-LS2-1

NGSS.MS-LS2-2

NGSS.MS-LS2-4

Which of the following is an example of organisms competing for abiotic factors?

• Two birds fighting over a worm

• Plants growing toward sunlight

• Wolves hunting deer

• Fish feeding on plankton

What is primary succession?

• The regrowth of an ecosystem after a wildfire

• The gradual development of an ecosystem in a previously uninhabited area

• The replacement of one species by another

• The destruction of an ecosystem

Which of the following would most likely lead to primary succession?

• A. A forest fire

• B. A volcanic eruption creating new land

• C. A flood damaging farmland

• D. A hurricane destroying trees

What type of succession occurs after a natural disaster such as a wildfire?

• Primary succession

• Secondary succession

• Biodiversity

• Pioneer succession

Which species are the first to colonize an area in primary succession?

• Large trees

• Pioneer species like mosses and lichens

• Wolves and bears

• Tall grasses

How does secondary succession differ from primary succession?

• Secondary succession happens in areas that already had life

• Secondary succession takes longer than primary succession

• Secondary succession starts on bare rock

• Secondary succession occurs only in the ocean.