Drag each tile to the correct box.
Put the stages of the nitrogen cycle in their correct order.
The Correct Answer and Explanation is :
The nitrogen cycle is a crucial ecological process that converts nitrogen into various chemical forms, which can be used by living organisms. Here are the stages of the nitrogen cycle in the correct order:
- Nitrogen Fixation
- Nitrification
- Assimilation
- Ammonification (Decomposition)
- Denitrification
Explanation of Each Stage:
- Nitrogen Fixation: This is the first step in the nitrogen cycle where atmospheric nitrogen (N₂), which is not usable by most living organisms, is converted into ammonia (NH₃) or related compounds. This process is carried out by specific bacteria, often found in the root nodules of legumes, as well as by lightning and industrial processes.
- Nitrification: In this second stage, ammonia is oxidized to nitrites (NO₂⁻) and then to nitrates (NO₃⁻) by nitrifying bacteria. This process is vital as plants primarily absorb nitrogen in the form of nitrates. Nitrification typically occurs in well-aerated soils and is crucial for converting ammonia into a form that plants can utilize.
- Assimilation: During assimilation, plants absorb the nitrates from the soil and incorporate them into organic molecules such as amino acids and proteins. When animals consume plants (or other animals that have consumed plants), they assimilate the nitrogen into their own bodies.
- Ammonification (Decomposition): When organisms die or produce waste, the nitrogen within their bodies is returned to the soil through a process called ammonification. Decomposers like bacteria and fungi break down the organic matter, releasing ammonia back into the soil.
- Denitrification: This final step involves the conversion of nitrates back into nitrogen gas (N₂) by denitrifying bacteria, releasing it back into the atmosphere. Denitrification is essential as it completes the nitrogen cycle and prevents the accumulation of excess nitrates in the soil, which could lead to problems like eutrophication in aquatic systems.
Understanding the nitrogen cycle is critical for maintaining healthy ecosystems and optimizing agricultural practices, as nitrogen is a key nutrient for plant growth.