Edexcel International GCSE Biology
Edexcel International GCSE Biology Cycles within Ecosystems Exam Questions
Free Edexcel International GCSE Biology exam questions on Cycles within Ecosystems, with mark schemes. Covers the carbon cycle and nitrogen cycle.
Cycles within Ecosystems exam questions
These packs of real past exam questions cover the whole of Section 4: Ecology and the Environment, including Cycles within Ecosystems. Work through every question on this sub-topic, then mark your answers against the mark scheme.
StemUp mark scheme flashcards
Edexcel IGCSE Biology 4BI1 Flashcards (Anki & Quizlet)
Every answer is written in mark scheme wording, so you learn exactly what examiners give marks for. Use them on Anki or Quizlet, then test yourself with the questions on this page.
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About Edexcel International GCSE Biology Cycles within Ecosystems
This sub-topic covers nutrient cycling.
What you need to know
- Carbon cycle Photosynthesis, respiration, combustion and decomposition.
- Nitrogen cycle Fixation, nitrification, denitrification and decomposition.
- Microorganisms Roles of bacteria in cycles.
Common mistakes in Cycles within Ecosystems
- Mixing nitrifying and denitrifying bacteria.
- Forgetting combustion releases CO₂.
Try two Cycles within Ecosystems exam-style questions
1. Name the process that removes CO₂ from the air. (1 mark)
Show the mark scheme answer
Photosynthesis.
2. State the role of nitrifying bacteria. (1 mark)
Show the mark scheme answer
Convert ammonium ions to nitrates.
Cycles within Ecosystems FAQs
What does this cover?
Carbon and nitrogen cycles.
Why are decomposers important?
They return nutrients to the soil.
Revise this topic with flashcards: Edexcel IGCSE Biology 4BI1 Flashcards, with mark scheme answers for Anki and Quizlet.
