# "Describe" questions — Pearson Edexcel International GCSE Biology (4BI1)

> 52 questions · biology

## How to answer

Say WHAT happens, in order. No reasoning. Structure: 1. First X. 2. Then Y. 3. Then Z. Assessment Objective: AO1. Every "describe" answer on this spec is marked against exactly this pattern.

## Sample questions

1. [Describe the role of nitrifying bacteria and denitrifying bacteria in the nitrogen cycle.](https://www.gradenine.co.uk/q/describe-the-role-of-nitrifying-bacteria-02f69307)
2. [Describe the roles of the sensory neurone, relay neurone and motor neurone in carrying a nerve impulse during a reflex a…](https://www.gradenine.co.uk/q/describe-the-roles-of-the-sensory-0509a409)
3. [Describe the role of stomata and the spongy mesophyll layer in gas exchange in a flowering plant.](https://www.gradenine.co.uk/q/describe-the-role-of-stomata-and-0c176178)
4. [Describe the role of xylem vessels in the transport of water through a flowering plant, including the features of xylem …](https://www.gradenine.co.uk/q/describe-the-role-of-xylem-vessels-10551e2e)
5. [Describe the functions of the nucleus, mitochondria, ribosomes and cell membrane in a eukaryotic cell.](https://www.gradenine.co.uk/q/describe-the-functions-of-the-nucleus-10f3eec1)
6. [Describe how auxin causes a plant root to respond to the force of gravity.](https://www.gradenine.co.uk/q/describe-how-auxin-causes-a-plant-13884afd)
7. [Describe how osmosis causes a plant cell to become turgid when it is placed in a solution that is more dilute than the c…](https://www.gradenine.co.uk/q/describe-how-osmosis-causes-a-plant-14631faf)
8. [Describe the differences between sexual reproduction and asexual reproduction in terms of the number of parents involved…](https://www.gradenine.co.uk/q/describe-the-differences-between-sexual-reproduction-158d4ac6)

## Related

- [Pearson Edexcel International GCSE Biology (4BI1) revision notes](https://www.gradenine.co.uk/learn/pearson-edexcel-international-gcse-biology-4bi1)
- [Pearson Edexcel International GCSE Biology (4BI1) past papers](https://www.gradenine.co.uk/past-papers/pearson-edexcel-international-gcse-biology-4bi1)
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