Flashcards
OCR A2 Biology: The Nitrogen Cycle
Flashcards do conjunto (10)
- 1Why do plants and animals need Nitrogen?To make proteins and nucleic acid for growth
- 2What is Nitrogen Fixation?Nitrogen gas in the atmosphere is converted to ammonia by Rhizobium
- 3What is ammonification?Nitrogen compounds from dead organisms or animal waste are turned into ammonium compounds by decomposers.
- 4What is Nitrification?Ammonium compounds in the soil are changed into nitrogen compounds that can be used by plants.
- 5Describe the process of Nitrification1. Nitrosomonas bacteria change ammonium compounds into nitrites
2. Nitrobacter convert nitrites into nitrates - 6What is denitrification?Nitrates in the soil are converted into nitrogen gas by denitrifying bacteria.
- 7Describe the process of denitrificationThey use nitrates in the soil for respiration and produce nitrogen gas. This happens under anaerobic conditions.
- 8What natural way can nitrogen enter an ecosystem?By lightning
- 9What unnatural way can nitrogen enter an ecosystem?Artificial fertilisers
- 10What is the order of The Nitrogen Cycle1. Nitrogen Fixation
2. Ammonification
3. Nitrification
4. Denitrification (Or back to 2)
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- A-Level Biology FlashCards sobre OCR A2 Biology: The Nitrogen Cycle, criado por hannawin98 em 16-05-2016.
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