The Nitrogen Cycle

Carbon Cycle

Ms. M

Multiple Choice

When humans burn fossil fuels, most of the carbon quickly enters the as carbon dioxide.

• Water

• Atmosphere

• Sun

• Air

Multiple Choice

When humans burn fossil fuels, most of the carbon quickly enters the                       as carbon dioxide.

• Water

• Atmosphere

• Sun

• Air

WATER CYCLE

Multiple Choice

Including the oceans, saltwater lakes, and saltwater seas, how much of the water on Earth is saltwater?

• 3%

• 50%

• 97%

• 100%

Multiple Choice

What percentage of Earth's freshwater is groundwater?

• 2.5%

• 3%

• 30%

• 68%

Multiple Choice

What percentage of the freshwater on Earth is surface water?

• 1.2%

• 2.5%

• 30%

• 68%

Multiple Choice

What is another term for the Water Cycle?

• Hydrogen cycle

• Hydrological Cycle

• Hydrosphere Cycle

Multiple Choice

What powers the water cycle?

• The Sun

• The Moon

• Heat from Inner Earth

Multiple Choice

Which of the following is associated with condensation?

• Liquid water changing into solid water

• Solid water changing into liquid water

• Liquid water changing into water vapor

• Water vapor changing into liquid water

Multiple Choice

How does water become groundwater?

• Soaks into the ground through infiltration

• Rises into the ground from inner Earth

• It flows into the ground from the Ocean

Multiple Choice

During photosynthesis...

• plants take in oxygen and release carbon dioxide

• plants release oxygen and take in carbon dioxide

• plants release carbon dioxide and take in oxygen

Multiple Choice

What part of a plant is similar to the mouths of animals , in that plants use these openings to take in or release oxygen and carbon dioxide?

• Chloroplasts

• Leaves

• Roots

• Stoma

Multiple Choice

Through which process is water vapor released from plants into the atmosphere?

• Infiltration

• Transpiration

• Condensation

• Precipitation

Multiple Choice

What happens to water that does not infiltrate into the ground?

• It evaporates into the hydrosphere

• It flows downhill as surface runoff

• It precipitates into the atmosphere

Multiple Choice

Water in large lakes and oceans comes from

• only the surface

• only groundwater

• both surface and groundwater

Multiple Choice

Organisms need nitrogen in order to...

• To breathe

• To obtain water for growth

• To build proteins & DNA

• To regulate temperature

Multiple Choice

Gas that makes up 78% of our atmosphere.

• Oxygen

• Nitrogen

• Hydrogen

• Carbon Dioxide

Multiple Choice

Based on the picture, what is the chemical formula for atmospheric nitrogen?

• N

• N₂

• NH₃

• NO₃

Multiple Choice

Plants and animals cannot use nitrogen directly from the air.

• True
• False

Multiple Choice

Which of these nitrogen cycle processes converts atmospheric nitrogen to a soil form of nitrogen that is usable by plants?

• nitrogen fixation

• nitrification

• denitrification

• ammonification

Multiple Choice

Bacteria fix nitrogen from the atmosphere into a form plants can use.

• True

• False

Multiple Choice

How nitrogen is "fixed" into useable form for plants...

• through action of bacteria only
• through lightning only
• through action of bacteria & lightning
• through photosynthesis

Multiple Choice

How do animals get the nitrogen they need?

• From the air they breathe

• From the water they drink

• From the food they eat

• From the sun

Multiple Choice

How does fertilizer affect the ecosystem?

• the bacteria reproduce quicker

• causes increase in rain, thereby increasing flooding of ponds and lakes

• create large algae blooms in the water

• cause the nitrogen fixing bacteria in the soil to be more productive