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The Nitrogen Cycle. Quick Write In this chapter, you will learn about the formation of the Solar System. Write down these questions and answer them in.

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Presentation on theme: "The Nitrogen Cycle. Quick Write In this chapter, you will learn about the formation of the Solar System. Write down these questions and answer them in."— Presentation transcript:

1 The Nitrogen Cycle

2 Quick Write In this chapter, you will learn about the formation of the Solar System. Write down these questions and answer them in complete sentences. 1. Why is N important to living things? 2. What percentage of the AS is N?

3 1. Why do living things need N? For amino acids needed for proteins. 2. Different forms of N in the biosphere? N 2 gas in atmosphere NH 3 (ammonia) Nitrate (NO 3 ) Nitrite (NO 2 )

4 3. Nitrogen gas (N 2 )? 78% of the AS is made up of this gas. 4. NH 3, NO 2 and NO 3 ? Found in wastes of many orgs and in dead and decaying organic matter.

5 Check for Understanding Why do living things need N? N 2 gas makes up ___% of the atmosphere. What are the 3 other main types of N on Earth? Movie

6 5. Nitrogen fixation? Certain bacteria convert N 2 gas into ammonia (NH 3 ). N gets ‘fixed’ into a form plants can use. 6. Then what? Other bacteria convert NH 3 into NO 2 and NO Why are NO 2 and NO 3 important? They help plants grow. Commonly found in fertilizers.

7 8. Then what? NO 2 and NO 3 can be used by plants to make amino acids and proteins. 9. Animals and N? Consumers use the N from plants to make their amino acids and proteins.

8 Check for Understanding _____ _____ is the process of converting Nitrogen gas from the atmosphere into a form plants can use. Ammonia gets converted to ____ or ____, both of which are used for plant growth, production of amino acids, and proteins. Movie Where do animals get their Nitrogen for their amino acids and proteins?

9 10. Denitrification? Where N fixation is converting N 2 gas into NH 3, denitrification is the opposite. 11. DN process? When orgs die, NH 3 returns to soil. 12. Then what? NH 3 used by other plants, or bacteria convert back to N 2 gas.

10 13. Other ways N is added to environment? Excretion by land orgs Excretion by marine orgs 14. Excretion? NH 3 is found in urine and solid wastes produced by organisms.

11 Check for Understanding Denitrification is the process where ____ is converted back to ____ and released to the AS. What is another process where Nitrogen is added to the environment by land and marine organisms?


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