Unit 3- Biogeochemical Cycles

Front

What is a biogeochemical cycle?

Back

A biogeochemical cycle is the movement of elements and compounds through biological, geological, and chemical processes in the environment.

Front

What are the main components of the nitrogen cycle?

Back

The main components include nitrogen fixation, nitrification, assimilation, ammonification, and denitrification.

Front

What is nitrogen fixation?

Back

Nitrogen fixation is the process by which nitrogen gas (N₂) is converted into ammonia (NH₃) by nitrogen-fixing bacteria.

Front

What is the role of decomposers in biogeochemical cycles?

Back

Decomposers break down organic matter, returning nutrients to the soil and making them available for plant uptake.

Front

What is the phosphorus cycle?

Back

The phosphorus cycle is the movement of phosphorus through the lithosphere, hydrosphere, and biosphere, primarily through weathering of rocks.

Front

How do fertilizers impact the nitrogen cycle?

Back

Fertilizers can lead to increased nitrogen levels in the soil, which may cause leaching of nitrates into groundwater.

Front

What is leaching in the context of the nitrogen cycle?

Back

Leaching is the process by which soluble substances, such as nitrates, are washed out of the soil and into groundwater.

Front

What is the primary source of phosphorus in ecosystems?

Back

The primary source of phosphorus is rocks and minerals.

Front

What is the significance of the water cycle in ecosystems?

Back

The water cycle is crucial for maintaining the availability of water for plants, animals, and human activities.

Front

What is the process of nitrification?

Back

Nitrification is the conversion of ammonia (NH₃) into nitrites (NO₂⁻) and then into nitrates (NO₃⁻) by bacteria.