# Explain why starch is described as an energy storage molecule in plants, and describe the chemical elements that make up a starch molecule.

> Pearson Edexcel International GCSE Biology (4BI1) — 2.3 Biological molecules · Explain · 4 marks

## Mark scheme (4 marks)

1. Starch is made up of many glucose molecules joined together
2. Glucose can be released from starch and used in respiration to release energy
3. Starch contains the element carbon
4. Starch contains the elements oxygen and hydrogen

## Key terms

- [starch](https://www.gradenine.co.uk/glossary/starch)
- [energy storage](https://www.gradenine.co.uk/glossary/energy-storage)

## Related

- [Revision notes for Pearson Edexcel International GCSE Biology (4BI1)](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-why-starch-is-described-as-f383dc21) · Published by Druglandscape Ltd.