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3.5 Energy transfers in and between organisms
Quick questions on Nutrient cycles: the nitrogen cycle, phosphorus cycle and eutrophication - AQA A-Level Biology
5short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is the nitrogen cycle?Show answer
Plants need nitrogen for amino acids, proteins and nucleic acids, but cannot use nitrogen gas directly. Four groups of bacteria drive the cycle.
What is the phosphorus cycle?Show answer
Phosphorus is needed for phospholipids, ATP, DNA and RNA. The phosphorus cycle has no gaseous phase, so it is slower than the nitrogen cycle.
What is q1?Show answer
Name the type of bacteria responsible for each of: converting nitrogen gas to ammonia, converting ammonium to nitrate, and converting nitrate to nitrogen gas. [3 marks]
What is q2?Show answer
Explain the role of mycorrhizae in the phosphorus cycle. [2 marks]
What is q3?Show answer
Describe how leaching of nitrate fertiliser can lead to the death of fish in a lake. [4 marks]
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