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Module 6: Genetics, evolution and ecosystems
Quick questions on Ecosystems and sustainability: energy flow, nutrient cycles, succession and conservation - OCR A-Level Biology A
7short 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 are energy flow through ecosystems?Show answer
Energy enters an ecosystem when producers fix light energy in photosynthesis:
What is the nitrogen cycle?Show answer
Microorganisms recycle nitrogen between the air, soil and organisms:
What is the carbon cycle?Show answer
Carbon moves between the atmosphere (as carbon dioxide) and organisms: photosynthesis removes carbon dioxide and fixes it into organic molecules; respiration, decomposition and combustion (including of fossil fuels) return it. Burning fossil fuels and deforestation are raising atmospheric carbon dioxide, contributing to climate change.
What is succession?Show answer
Succession is the change in a community over time:
What is q1?Show answer
Write the equation linking net and gross primary productivity. [1 mark]
What is q2?Show answer
Explain why only about 10 percent of energy is transferred between trophic levels. [2 marks]
What is q3?Show answer
Name the process by which nitrifying bacteria convert ammonium into nitrate. [1 mark]
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