GCSE Earth and Space – The nitrogen cycle

Last updated: 21/03/2021
GCSE Science – Irish Junior Cycle (Biology, Chemistry, Physics, Earth and Space) The Earth and atmosphere GCSE Earth and Space – The nitrogen cycle

Learning Objectives

-I can describe the nitrogen cycle

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  1. What percentage of the air is made up of nitrogen?

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  2. What is nitrogen gas in the air converted to?

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  3. What is used to convert nitrogen gas into nitrate compounds?

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  4. What also converts nitrogen gas in the air to nitrate compounds?

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  5. What process converts nitrogen gas into ammonia?

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  6. What is ammonia converted to?

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  7. What is used to convert ammonia to nitrates?

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  8. Where is nitrifying bacteria found?

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  9. What absorbs nitrates from the soil?

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  10. What do plants use nitrates for?

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  11. What is animal protein?

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  12. What are decomposers?

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  13. What returns nitrogen back to the soil?

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  14. How is nitrogen returned to the soil?

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  15. Once ammonia is returned to the soil, what is it converted to?

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  16. What is used to convert ammonia to nitrates when returning it to the soil?

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  17. What can denitrifying bacteria also to?

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  18. When does denitrifying bacteria return nitrogen gas back to the air?

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  19. What process reduces the amount of nitrogen gas returned to the air?

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  20. What does improving drainage do?

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  21. How can farmers increase the nitrate content of soil?

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  22. How can farmers increase the nitrate content of soil?

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  23. What is the definition of crop rotation?

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  24. Which of the following is an example of a natural fertiliser?

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  25. Which of the following is an example of a natural fertiliser?

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