# Explain how abiotic factors and biotic factors both affect the size of a population of rabbits living in a grassland ecosystem.

> WJEC GCSE Biology (Wales) — 1.6.1 Ecosystems · Explain · 4 marks

## Mark scheme (4 marks)

1. Abiotic factor correctly identified (e.g. temperature, rainfall, light intensity, soil type)
2. Explanation of how the named abiotic factor affects rabbit population size
3. Biotic factor correctly identified (e.g. predators, food availability, disease, competition)
4. Explanation of how the named biotic factor affects rabbit population size

## Key terms

- [abiotic factor](https://www.gradenine.co.uk/glossary/abiotic-factor)
- [biotic factor](https://www.gradenine.co.uk/glossary/biotic-factor)
- [population](https://www.gradenine.co.uk/glossary/population)
- [ecosystem](https://www.gradenine.co.uk/glossary/ecosystem)

## Related

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

---
Source: [GradeNine](https://www.gradenine.co.uk/q/explain-how-abiotic-factors-and-biotic-8d9b6162) · Published by Druglandscape Ltd.