Biogeochemical Cycles

Front

What is a biogeochemical cycle?

Back

A biogeochemical cycle is the movement of elements and compounds through living organisms and the physical environment, involving biological, geological, and chemical processes.

Front

What role do volcanoes play in the carbon cycle?

Back

Volcanoes increase the levels of CO2 in the atmosphere by releasing carbon dioxide during eruptions.

Front

Why is nitrogen essential for living organisms?

Back

Nitrogen is essential for living organisms because it is a key component of amino acids and proteins, which are vital for growth and development.

Front

What is nitrogen fixation?

Back

Nitrogen fixation is the process by which certain bacteria convert nitrogen gas (N2) from the atmosphere into ammonia (NH3), making it available for use by plants.

Front

What is the largest reservoir of nitrogen on Earth?

Back

The largest reservoir of nitrogen on Earth is the atmosphere, which contains about 78% nitrogen gas.

Front

What are the main processes of the water cycle?

Back

The main processes of the water cycle include evaporation, condensation, precipitation, and transpiration.

Front

Which process is NOT part of the water cycle?

Back

Freezing is NOT a process of the water cycle; the main processes are evaporation, condensation, precipitation, and transpiration.

Front

What is the role of bacteria in the nitrogen cycle?

Back

Bacteria play a crucial role in the nitrogen cycle by fixing nitrogen, converting ammonia to nitrates, and decomposing organic matter to release nitrogen back into the soil.

Front

What is the process of denitrification?

Back

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

Front

How do plants obtain nitrogen?

Back

Plants obtain nitrogen primarily through the uptake of nitrates and ammonium from the soil.