1. Bellringer Based on what you know about the water, carbon, and oxygen cycle, what do you think the nitrogen cycle is?

2. Agenda 1.Anticipatory Set 2.Input – The Nitrogen Cycle 3.Guided Practice 4.Independent Practice 5.Closing

3. Objective After today you will be able to explain the nitrogen cycle.

4. Big Goal Connection 80% Mastery!!! Big Ideas of Science – Systems and system models

5. 2.9 Nitrogen Cycle Class Notes

6. The Nitrogen Cycle All organisms need nitrogen.

7. Nitrogen Cycle Nitrogen gas makes up 80% of the atmosphere. However, plants and animals cannot use this form of nitrogen.

8. Let’s Practice… 1.Do organisms need nitrogen? 2.Can plants and animals get nitrogen out of the air? 3.What percentage of the air is nitrogen?

9. Nitrogen Cycle - B A A B B C C D D E E Bacteria that live on the roots of some plants take in the nitrogen gas and use nitrogen fixation to convert the gas into usable nitrogen.

10. Let’s Practice… 1.Which organism is able to take in nitrogen from the air? 2.What process do they use to convert nitrogen gas into usable nitrogen?

11. Nitrogen Cycle - C A A B B C C D D E E Plants absorb nitrogen from the soil.

12. Nitrogen Cycle - D A A B B C C D D E E Animals get their nitrogen from eating plants and other animals.

13. Nitrogen Cycle - E A A B B C C D D E E When plants and animals die, their nitrogen goes back into the soil.

14. Let’s Practice… 1.Where do plants get nitrogen? 2.How do animals get nitrogen? 3.What happens to nitrogen when plants and animals die?

15. GP1 How does the tree in this diagram get nitrogen?

16. GP2 Can the deer in the picture get nitrogen gas from the air?

17. GP3 Where can it get nitrogen?

18. GP4 What happens during nitrogen fixation?

19. GP5 What happens to the nitrogen in plants and animals after they die?

20. 2.9 Independent Practice

21. Homework Finish working on your weekly homework.