8th Grade Ecology

Which of the following is a biotic factor operating within an ecosystem?

• Predators hunting, killing and eating their prey.
• Sunlight increasing the temperature causing fish to die.
• Increasing pH because of human pollution in a river system
• Destruction of a forest ecosystem because of fire.

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NGSS.MS-LS2-4

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Fish dying when the pH goes too high are an example of: 

• an abiotic factor limiting an abiotic factor.
• an abiotic factor limiting a biotic factor.
• a biotic factor limiting an abiotic factor.
• a biotic factor limiting a biotic factor.

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NGSS.MS-LS2-4

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Which of the following is an abiotic factor that could possibly decrease a population if it drastically changes?

• Competition
• Predator-prey relationships
• Temperature
• Disease

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what is an abiotic change?

• the decrease in rainfall on an ecosystem

• the increase in squirrel population

• the decrease in bug population

• the increase in birds

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what is a biotic change

• the increase in rainfall in the amazon

• the decrease in rain in the amazon

• the increase in rocks on the ground

• the decrease in plant population

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If you find no insects at all in a pond or stream, what can you conclude?

• The water is clean.
• The water is very polluted.
• There is slight pollution.
• The water has little or no pollution.

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NGSS.MS-LS2-4

Scientists gathered the following data on lizard populations for several years. The results are shown in the table. Which environmental factor most likely contributes to the change in lizard population? 

• increase in available water and food
• increase in shelter
• increase in predators
• increase in light

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NGSS.MS-LS2-4

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Most water pollution is the result of

• human activities.
• drought.
• volcanic eruptions.
• storms.

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Which of the following statements correctly identifies a predator-prey relationship in this food web? 

• the herring is the predator and the tuna is its prey
• the blue crab is the predator and the sea otter is its prey
• the shark is the predator and the tuna is its prey
• the baleen whale is the predator and the killer whale is its prey

If the acidity in the oceans keep increasing every year, which poses a greater threat to the ocean life?

• coral reefs - the acid eats away at the calcium carbonate that makes up the reef.

• algae - the acid makes it easier for the algae to grow.

• sea turtles - the acid strengthens their shells.

• kelp - the acid strengthens their ability to keep their roots attached.

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NGSS.MS-LS2-4

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