# "Explain" questions — Cambridge International IGCSE Biology (0610)

> 131 questions · biology

## How to answer

WHAT + WHY. Every point paired with a because. Structure: X happens because Y. This causes Z because … Assessment Objective: AO2. Every "explain" answer on this spec is marked against exactly this pattern.

## Sample questions

1. [Explain how peristalsis moves food along the oesophagus.](https://www.gradenine.co.uk/q/explain-how-peristalsis-moves-food-along-0178498a)
2. [Monoculture is widely used in modern agriculture. Explain why farmers choose to grow crops as a monoculture and describe…](https://www.gradenine.co.uk/q/monoculture-is-widely-used-in-modern-02dd088c)
3. [A population of strawberry plants reproduces asexually by sending out runners that produce new plants. A fungal disease …](https://www.gradenine.co.uk/q/a-population-of-strawberry-plants-reproduces-08ea2127)
4. [Explain why bacteria are considered particularly useful organisms for producing human insulin by genetic modification.](https://www.gradenine.co.uk/q/explain-why-bacteria-are-considered-particularly-09b600cb)
5. [Explain why deforestation can lead to the extinction of species, and suggest two conservation measures that could be use…](https://www.gradenine.co.uk/q/explain-why-deforestation-can-lead-to-104ed96a)
6. [Explain why an enzyme stops working when the pH moves far from its optimum.](https://www.gradenine.co.uk/q/explain-why-an-enzyme-stops-working-1073db76)
7. [Explain why mammals have a double circulatory system rather than a single circulatory system.](https://www.gradenine.co.uk/q/explain-why-mammals-have-a-double-1104f85b)
8. [A scientist is classifying two species of beetle and two species of spider. Explain how using a dichotomous key would al…](https://www.gradenine.co.uk/q/a-scientist-is-classifying-two-species-13dca35f)

## Related

- [Cambridge International IGCSE Biology (0610) revision notes](https://www.gradenine.co.uk/learn/cambridge-international-igcse-biology-0610)
- [Cambridge International IGCSE Biology (0610) past papers](https://www.gradenine.co.uk/past-papers/cambridge-international-igcse-biology-0610)
- [Practise with AI marking (free)](https://www.gradenine.co.uk/start)