Water Cycle and Nitrogen Cycle

The process in which nitrogen circulates and is recycled is called

• The nitrogen cycle

• The carbon cycle

• The water cycle

• The phosphorus cycle

Organisms that need nitrogen to survive.

• only plants

• only animals

• only bacteria

• all living things

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

• bacteria

• rain

• fungi

• car exhaust

What is the role of denitrifying bacteria

• change nitrate back into nitrogen gas

• change nitrogen gas into nitrate

• absorb carbon dioxide in the soil

• release oxygen gas into the atmosphere

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What is the role of decomposing bacteria in the nitrogen cycle?

• change Nitrogen gas into Nitrate

• Return the nitrogen compounds to the soil

• Turn nitrogen into water

• Turn nitrate into nitrogen gas

According to this diagram, plants absorb

• nitrates

• nitrogen fixing bacteria

• animals

• decomposers

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What is the process by which water vapor turns into liquid water in the atmosphere?

• Condensation

• Evaporation

• Precipitation

• Transpiration

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Which of the following is a key component of the nitrogen cycle that converts atmospheric nitrogen into a form usable by plants?

• Nitrogen fixation

• Photosynthesis

• Respiration

• Transpiration

What is the primary source of energy that drives the water cycle?

• The Sun

• The Moon

• The Earth's core

• Wind

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In the nitrogen cycle, what is the process called when plants absorb nitrates from the soil?

• Assimilation

• Denitrification

• Ammonification

• Nitrification

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