# Explain how cells are organised into different levels of organisation in a multicellular organism, naming each level in the correct order from smallest to largest.

> Edexcel GCSE Biology (1BI0) — 1.2 Levels of organisation · Explain · 4 marks

## Mark scheme (4 marks)

1. Cells are the smallest level of organisation / cells are the basic structural and functional unit
2. A group of similar cells working together forms a tissue
3. Different tissues working together form an organ
4. Organs working together form an organ system, and organ systems work together to form an organism

## Key terms

- [cell](https://www.gradenine.co.uk/glossary/cell)
- [organ](https://www.gradenine.co.uk/glossary/organ)
- [organism](https://www.gradenine.co.uk/glossary/organism)
- [multicellular](https://www.gradenine.co.uk/glossary/multicellular)

## Related

- [Revision notes for Edexcel GCSE Biology (1BI0)](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)

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Source: [GradeNine](https://www.gradenine.co.uk/q/explain-how-cells-are-organised-into-10146dfd) · Published by Druglandscape Ltd.