# Describe the role of microorganisms in the carbon cycle.

> WJEC GCSE Biology (Wales) — 1.6.2 Nutrient cycles · Describe · 4 marks

## Mark scheme (4 marks)

1. Microorganisms decompose/break down dead organic matter (organisms/plants/animals)
2. Carbon is released as carbon dioxide during respiration by microorganisms
3. This returns carbon (dioxide) to the atmosphere
4. This process allows carbon to be recycled / reused by plants (for photosynthesis)

## Key terms

- [microorganisms](https://www.gradenine.co.uk/glossary/microorganisms)
- [carbon cycle](https://www.gradenine.co.uk/glossary/carbon-cycle)

## Related

- [Revision notes for WJEC GCSE Biology (Wales)](https://www.gradenine.co.uk/learn)
- [How to answer "Describe" questions](https://www.gradenine.co.uk/tools/command-word-cheatsheet)
- [Practice this with AI marking (free)](https://www.gradenine.co.uk/start)

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Source: [GradeNine](https://www.gradenine.co.uk/q/describe-the-role-of-microorganisms-in-dfaf707f) · Published by Druglandscape Ltd.