Limiting Factors

Which statement about limiting factors is true?

• If there are more plants than usual in an area, populations of animals that eat the plant will most likely decrease

• If the water supply in an area decreases, the population that needs the water will most likely increase

• If organisms no longer have enough space to survive, they will either move or die

• If a population of a prey increases, the population of predators will decrease because the availability of food is less

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NGSS.MS-LS2-1

NGSS.MS-LS2-4

Limiting factors affect how large a population of organisms can get. Which would help cause an increase in a plant population?

• Increase in shade

• Decrease in space

• Increase in rainfall

• Decrease in soil quality

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NGSS.MS-LS1-5

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What would happen to the deer population in an ecosystem if their major predators like mountain lions decrease in numbers?

• The population will increase because of fewer predators

• The population will decrease because of a lack of prey

• The population will remain the same because a new predator will replace the mountain lion

• The population will remain the same because a new prey will replace the deer

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NGSS.MS-LS2-1

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If water were to disappear in an ecosystem, what would be the most likely effect on that ecosystem?

• Both animals and plants would be unable to survive in the ecosystem

• Animals would be in competition with each other for food

• Plants would become consumers of animals

• Plants would begin producing their own water

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NGSS.MS-LS1-5

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A major fire destroys a forest. How does this destruction lead to a decrease in the population of native animals?

• By destroying the shelters of the animals

• By increasing the availability of food

• By decreasing the temperature of the forest

• By slowing the competition among animals

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NGSS.MS-LS2-1

NGSS.MS-LS2-4

Which of the following factors does NOT limit the size of a population (which is not a limiting factor to an ecosystem)?

• Food

• Time

• Space

• Water

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