Biogeochemical Cycles

Front

What is a biogeochemical cycle?

Back

A biogeochemical cycle is a natural process that recycles nutrients in various chemical forms from the environment to organisms and then back to the environment.

Front

What are the main components of the nitrogen cycle?

Back

The main components of the nitrogen cycle include nitrogen fixation, nitrification, ammonification, and denitrification.

Front

Define nitrogen fixation.

Back

Nitrogen fixation is the process by which atmospheric nitrogen (N2) is converted into ammonia (NH3) or related compounds in soil, primarily by bacteria and lightning.

Front

What is nitrification?

Back

Nitrification is the biological oxidation of ammonia to nitrite followed by the oxidation of nitrite to nitrate, primarily carried out by bacteria.

Front

What is the role of denitrification in the nitrogen cycle?

Back

Denitrification is the process by which bacteria convert nitrates back into nitrogen gas (N2), returning it to the atmosphere and completing the nitrogen cycle.

Front

What is the primary source of carbon dioxide in the atmosphere?

Back

The primary source of carbon dioxide in the atmosphere is the burning of fossil fuels.

Front

Explain the process of ammonification.

Back

Ammonification is the process by which organic nitrogen from dead organisms and waste is converted into ammonia by decomposer bacteria.

Front

What is the impact of excess nitrogen and phosphorus in aquatic ecosystems?

Back

Excess nitrogen and phosphorus can lead to algal blooms, depletion of oxygen, and death of aquatic fauna.

Front

How does carbon enter the atmosphere during a forest fire?

Back

During a forest fire, carbon stored in trees and vegetation is released into the atmosphere as carbon dioxide.

Front

What is the significance of photosynthesis in the carbon cycle?

Back

Photosynthesis is the process by which plants convert carbon dioxide into organic compounds, playing a crucial role in the carbon cycle.