# 4-mark practice questions — WJEC GCSE Biology (Wales)

> 145 questions · biology

## How to answer

4-mark questions are the shortest levels-of-response band. Aim for four scientific ideas, each in its own short sentence.

## Sample questions

1. [Describe how water moves from the soil into a plant and up to the leaves.](https://www.gradenine.co.uk/q/describe-how-water-moves-from-the-04dd95cb)
2. [Explain why a person who has recovered from chickenpox is unlikely to become ill from the same disease again.](https://www.gradenine.co.uk/q/explain-why-a-person-who-has-080c18cd)
3. [Explain why the energy requirements of two people of the same age and body mass may be different.](https://www.gradenine.co.uk/q/explain-why-the-energy-requirements-of-098ddfbc)
4. [Explain why a habitat with a large number of different species is considered to have high biodiversity.](https://www.gradenine.co.uk/q/explain-why-a-habitat-with-a-09c01890)
5. [Describe the path taken by an oxygen molecule from the nose to the alveoli.](https://www.gradenine.co.uk/q/describe-the-path-taken-by-an-0e81f36f)
6. [Describe how a mutation in a gene could affect the phenotype of an organism.](https://www.gradenine.co.uk/q/describe-how-a-mutation-in-a-0ea3375b)
7. [Describe what happens to a protein-rich food, such as a piece of chicken, as it passes through the human digestive syste…](https://www.gradenine.co.uk/q/describe-what-happens-to-a-protein-rich-101c5663)
8. [Explain why decomposers are essential for returning nutrients to the soil, and describe what would happen to plant growt…](https://www.gradenine.co.uk/q/explain-why-decomposers-are-essential-for-104e2fd4)

## Related

- [WJEC GCSE Biology (Wales) revision notes](https://www.gradenine.co.uk/learn/wjec-gcse-biology-wales)
- [WJEC GCSE Biology (Wales) past papers](https://www.gradenine.co.uk/past-papers/wjec-gcse-biology-wales)
- [Practise with AI marking (free)](https://www.gradenine.co.uk/start)