Biogeochemical Cycle: The Nitrogen Cycle Quiz

Bacteria are directly responsible for nitrogen fixation. Nitrogen fixation is the process by which atmospheric nitrogen is converted into a form that can be used by plants and other organisms. Certain bacteria, such as Rhizobium and Azotobacter, have the ability to convert atmospheric nitrogen into ammonia, which can then be used by plants to synthesize proteins and other nitrogen-containing compounds. Humans, animals, and sunlight do not have the ability to directly fix nitrogen.

Nitrogen exists in abundance in Earth's atmosphere. It makes up about 78% of the air we breathe. The atmosphere is a layer of gases surrounding the Earth, and nitrogen is the most abundant gas in this layer. It is essential for life as it is a key component of proteins and DNA. Nitrogen also plays a vital role in the nitrogen cycle, which is crucial for the growth of plants and the overall balance of ecosystems.

Approximately 78% of the world's atmosphere is comprised of Nitrogen. This is a significant percentage, indicating that Nitrogen is the most abundant gas in the Earth's atmosphere. It plays a crucial role in various biological processes and is essential for the growth of plants and animals. Nitrogen also helps to regulate the Earth's climate and acts as a buffer against harmful radiation from the sun. Its high concentration in the atmosphere contributes to the overall stability and composition of the Earth's atmosphere.

The correct order is Fixation, Nitrification, Ammonification, Dentrification. Fixation refers to the process of converting atmospheric nitrogen into a form that can be used by plants. Nitrification is the conversion of ammonium into nitrate by bacteria. Ammonification is the process of converting organic nitrogen into ammonium ions. Dentrification is the final step in the nitrogen cycle, where nitrate is converted back into atmospheric nitrogen by bacteria.

Plants cannot utilize nitrogen naturally occurring in the atmosphere because the triple bonds between two nitrogen atoms are hard to break. Nitrogen gas (N2) is very stable and cannot be directly used by plants. It requires a process called nitrogen fixation, which is carried out by certain bacteria that can convert N2 into a form that plants can use, such as ammonia (NH3) or nitrate (NO3-). These bacteria have the ability to break the strong triple bonds in N2, making nitrogen available for plant growth.

The correct answer is Denitrification, Nitrification, and Ammonification. These three processes are similar to Fixation because they all involve the transformation or conversion of nitrogen compounds. Denitrification is the process by which nitrate is converted back into nitrogen gas, while nitrification is the process by which ammonia is converted into nitrate. Ammonification, on the other hand, is the process by which organic nitrogen compounds are converted into ammonia. These processes play important roles in the nitrogen cycle, contributing to the availability and cycling of nitrogen in ecosystems.

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Nitrogen is what gives plants their healthy green colour.

Nitrogen fixation is the process by which atmospheric nitrogen gas is converted into a usable form by certain microorganisms, primarily bacteria. These bacteria convert nitrogen gas into ammonia (NH3), which can then be utilized by plants to synthesize essential organic compounds like amino acids and proteins. This process is crucial for the nitrogen cycle and the availability of nitrogen for various life forms.