Nitrogen Fixation and Nitrification Processes

Podcast Beta

Play an AI-generated podcast conversation about this lesson

Questions and Answers

Where does the phosphorus cycle start?

In the atmosphere

In living organisms

In the oceans

In the earth's crust (correct)

What percentage of phosphorus do humans contain in their teeth and bones?

80% (correct)

50%

20%

95%

How do plants absorb phosphate salts to obtain phosphorus?

Through absorption from soil (correct)

Through breathing

Through consumption of animals

Through photosynthesis

How does the phosphorus cycle return phosphorus to the environment for reuse?

Through decomposition of dead plants and animals Signup and view all the answers

Why do farmers apply phosphate fertilizers on land?

To make up for low phosphate salt concentrations in soil Signup and view all the answers

What happens to phosphate salts when they do not dissolve in water properly?

They affect plant growth in aquatic ecosystems Signup and view all the answers

What is the second most abundant gas present in the atmosphere?

Oxygen Signup and view all the answers

Which process involves the conversion of molecular nitrogen into ammonia?

Nitrogen Fixation Signup and view all the answers

How do green plants contribute to the oxygen cycle?

They release oxygen into the atmosphere Signup and view all the answers

Which element is the key building block of DNA and essential for plant growth?

Nitrogen Signup and view all the answers

What is the process by which ammonia is converted into nitrites and then nitrates?

Nitrification Signup and view all the answers

What happens to carbon when plants and animals decompose?

It is released back into the atmosphere Signup and view all the answers

What is the process in which nitrogen gas is converted to ammonia by Azotobacter and Rhozobium?

Ammonification Signup and view all the answers

How are nitrites formed in the nitrogen cycle?

During oxidation of ammonia by Nitrosomonas Signup and view all the answers

What happens during assimilation in the nitrogen cycle?

Primary producers take in nitrogen compounds from the soil Signup and view all the answers

Which stage of the nitrogen cycle involves converting ammonia into nitrate by bacteria in the soil?

Nitrification Signup and view all the answers

What is the final stage of the nitrogen cycle that involves nitrogen compounds returning to the atmosphere?

Denitrification Signup and view all the answers

How is ammonia produced in the nitrogen cycle?

By decomposers converting organic matter back into ammonium Signup and view all the answers

Study Notes

Carbon, the sixth most abundant element in the universe, can exist in pure forms like diamonds or combine with other elements to form molecules. It makes up 18% of the human body in sugar, glucose, and proteins.
In the carbon cycle, plants absorb carbon from the atmosphere for photosynthesis, which is then passed on to animals when they consume these plants. Upon death and decomposition, carbon is released back into the atmosphere.
Some carbon not released back into the atmosphere becomes fossil fuels, which are used in man-made activities, contributing to more carbon being pumped into the atmosphere.
Oxygen, the second most abundant gas in the atmosphere, is released by all green plants. Animals exhale carbon dioxide, which is used by plants during photosynthesis.
Nitrogen, the most abundant element in the atmosphere, is essential for life as a key building block of DNA and crucial for plant growth.

Studying That Suits You

Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

Description

Learn about the conversion of nitrogen gas to ammonia by bacteria like Azotobacter and Rhozobium, and the subsequent transformation into ammonium. Explore the nitrification process where ammonia is converted into nitrate by soil bacteria, along with the formation of nitrites. Discover how lightning, forest fires, and hot lava can also play a role in nitrogen conversion.