Biogeochemical Quiz

What is the role of Bacteria in the Nitrogen Cycle?

• It "fixes" nitrogen in the air, converting it into a solid that plants can use

• It "eats" nitrogen, converting it into Carbon Dioxide gas

• It serves as a nitrogen sink, removing extra nitrogen from the cycle

• Bacteria does not play a role in the nitrogen cycle

The overall amount of water on Earth......

• Remains constant

• Is increasing

• Is decreasing

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Burning fossil fuels coupled with deforestation increases the amount of _____ in the atmosphere

• phosphorus

• carbon dioxide

• ozone

• sulfur dioxide

• all of these

Ammonium (NH₄⁺) are converted to nitrate (NO₃-) and nitrite (NO₂-) through which process?

• assimilation

• denitrification

• nitrogen fixation

• nitrification

• ammonification

Which form of nitrogen is MOST usable to MOST plants?

• nitrate

• nitrogen gas

• ammonium

• ammonia

• atomic nitrogen

How do living organisms return carbon to the atmosphere in the carbon cycle?

• respiration and photosynthesis
•  decomposition and respiration

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How is the burning of fossil fuels related to global warming?

• Magic
• Fuels are hot
• Greenhouse effect
• Photosynthesis

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Identify the cycle pictured.

• The Water cycle
• The Carbon cycle
• The Nitrogen cycle
• The Phosphorus cycle.

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Which nutrient is not cycled through the atmosphere?

• carbon
• nitrogen
• phosphorous
• water

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What happens during the process of denitrification?

• Nitrogen compounds turn into free nitrogen
• Free nitrogen turns into nitrogen compounds

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