Ecosystems and Cycles of Matter

What converts nitrogen into a useable form for plants and animals?

• bacteria
• fungi
• rain

Animals obtain the nitrogen they need directly from the

• soil in their habitat
• air they breathe
• plants they eat
• bacteria living within them

Which of the following describes the role of nitrogen-fixing bacteria in the nitrogen cycle? Nitrogen-fixing bacteria convert

• nitrates intro nitrogen gas
• ammonia into proteins
• nitrogen gas into ammonia
• proteins into nitrates

How much of the atmosphere is composed of nitrogen gas?

• 87%

• 38%

• 78%

• 21%

If all the trees on Earth were destroyed, what would be the effect on humans?

• there would be a lack of food

• there would be a lack of oxygen

• there would be a lack of fresh water

• there would be a lack of carbon dioxide

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NGSS.MS-LS1-6

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If the Sun stopped shining, plants and animals would not survive because ___________________.

• All living things need the sun's energy to survive.

• The statement is false. Living things can live without the sun.

• Plants use the Sun's energy to make carbon dioxide and release glucose.

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NGSS.MS-LS1-6

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Which cycle of matter involves plants and animals passing oxygen and carbon dioxide to each other and the atmoshpere?

• Water Cycle

• Carbon & Oxygen Cycle

• Energy Pyramid

• Nitrogen Cycle

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________________ could increase the amount of oxygen in the air.

• Building more houses

• Burning more oil

• Paving more streets

• Planting more trees

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What is precipitation?

• The part of the water cycle when the sun heats up water, turning it from a liquid into water vapor or steam. It rises from the ground into the air.

• The part of the water cycle when the water vapor in the air gets cold. The water turns back into a liquid and forms clouds.

• The part of the water cycle when clouds get heavy and can no longer hold the liquid water. This causes the water to fall from the sky to the earth as rain, snow, sleet, or hail.

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NGSS.MS-ESS2-1

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In the water cycle, what is the process in which the sun heats up surface water, and speeds up the atoms movement until the liquid water turns to water vapor gas and rises into the air?

• Condensation

• Transpiration

• Evaporation

• Precipitation

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NGSS.MS-ESS2-4

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