Earth's Cycles: Quick Review

1. What converts nitrogen gas into a usable form for plants and animals?

• rain

• bacteria

• car exhaust

• fungi

How is nitrogen "fixed" into a usable form for plants?

• Through action of bacteria only

• Through lightning only

• Through action of bacteria and lightning

• Through photosynthesis

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NGSS.MS-LS2-3

Gas that makes up 78% of our atmosphere.

• Oxygen

• Nitrogen

• Hydrogen

• Carbon Dioxide

All of the carbon in existence is continually recycled in the carbon cycle.

• True

• False

Which of the following removes carbon from the atmosphere?

• Combustion

• Respiration

• Photosynthesis

• Death

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NGSS.MS-LS1-6

Organisms that do not decompose can be buried and become what?

• water

• nitrogen

• nutrients

• fossil fuels

Which process converts carbon in the form of sugar into carbon dioxide gas?

• Bioremediation
• Photosynthesis
• Respiration
• Transpiration

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NGSS.HS-LS1-7

If the plant population decreased, the amount of carbon would _________.

• Stay the same
• Increase
• Decrease

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NGSS.MS-LS2-1

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Which describes the relationship between plants and animals in the carbon cycle?

• Plants produce and release oxygen that animals need

• Plants produce and release carbon dioxide that animals need

• Animals produce and release oxygen that plants need

• Animals produce oxygen that plants turn into carbon dioxide

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NGSS.MS-LS1-6

NGSS.MS-LS2-3

What is the energy source for the water cycle?

• the sun
• the earth
• water
• the moon

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NGSS.MS-ESS2-1

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