# "Explain" questions — Pearson Edexcel A-Level Biology A (9BI0)

> 162 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. [A person receives a vaccination against influenza. Some months later, the same person is exposed to the influenza virus.…](https://www.gradenine.co.uk/q/a-person-receives-a-vaccination-against-000e3fd1)
2. [A farmer stores bales of hay outdoors over winter. By spring, the bales that were left uncovered and in contact with the…](https://www.gradenine.co.uk/q/a-farmer-stores-bales-of-hay-002c253d)
3. [A wildlife charity is monitoring two woodland habitats: Habitat A, which has been managed to support a wide variety of p…](https://www.gradenine.co.uk/q/a-wildlife-charity-is-monitoring-two-004a7275)
4. [A population of finches lives on a mainland. Some finches migrate to a remote island far out at sea, where they cannot r…](https://www.gradenine.co.uk/q/a-population-of-finches-lives-on-05266856)
5. [Explain how the immune system responds when a pathogen enters the body for the first time and produces a faster response…](https://www.gradenine.co.uk/q/explain-how-the-immune-system-responds-0677693d)
6. [Explain how the structure of capillaries is adapted to allow efficient exchange of substances between the blood and body…](https://www.gradenine.co.uk/q/explain-how-the-structure-of-capillaries-06be1a8c)
7. [A farmer grows wheat in a large field. The wheat is eaten by mice, which are eaten by owls. The farmer wants to produce …](https://www.gradenine.co.uk/q/a-farmer-grows-wheat-in-a-0ea2fd46)
8. [Explain how the five-kingdom classification system groups living organisms, and state one limitation of using only obser…](https://www.gradenine.co.uk/q/explain-how-the-five-kingdom-classification-system-108e43c3)

## Related

- [Pearson Edexcel A-Level Biology A (9BI0) revision notes](https://www.gradenine.co.uk/learn/pearson-edexcel-a-level-biology-a-9bi0)
- [Pearson Edexcel A-Level Biology A (9BI0) past papers](https://www.gradenine.co.uk/past-papers/pearson-edexcel-a-level-biology-a-9bi0)
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