Practice by topic,
not by paper.
Pick any topic and get every question ever set on it, pulled from real past papers across the years. Flip between the question and the full mark scheme in one click.
| largest ⟶ smallest | ||||
|---|---|---|---|---|
| A | centrioles | ribosomes | lysosomes | nucleoli |
| B | centrioles | nucleoli | lysosomes | ribosomes |
| C | nucleoli | lysosomes | centrioles | ribosomes |
| D | nucleoli | centrioles | ribosomes | lysosomes |
| Question | Answer | Marks |
|---|---|---|
| 6 | C | 1 |
Pick a topic
Choose any syllabus topic, or drill into a single subtopic.
Practise real questions
Work through every question set on it, tagged by paper and year.
Check the answer
Flip to the official mark scheme, then read the examiner notes.
Built to find your weak spots.
Topics and
subtopics.
Go beyond the chapter. Drill into any subtopic in your syllabus and practise only the questions written for it.
- Every syllabus topic & subtopic
- Only the questions written for that subtopic
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Filter down to the
questions that matter.
Narrow the bank by difficulty, year and session, read the examiner notes to see exactly what trips students up, then pick out the hardest questions and build a paper in seconds.
- Filter by difficulty, year & session
- Read examiner notes on every question
- Hand-pick questions into a custom paper
- Generate & download the paper instantly
This question discriminated well. The most common incorrect response was B, chosen by candidates who placed nucleoli before lysosomes; a nucleolus (1–3 µm) is larger than a lysosome (0.2–0.5 µm).
Ribosomes (≈25 nm) are the smallest of the four structures listed, which rules out A and D immediately. The correct answer was C.
Read what the
examiners said.
Open the examiner notes on any question to see how candidates actually answered it, the most common wrong answer, and why the correct one is right.
- Official examiner notes on every question
- See the answer most students got wrong
- Learn exactly where marks are lost
| largest ⟶ smallest | ||||
|---|---|---|---|---|
| A | centrioles | ribosomes | lysosomes | nucleoli |
| B | centrioles | nucleoli | lysosomes | ribosomes |
| C | nucleoli | lysosomes | centrioles | ribosomes |
| D | nucleoli | centrioles | ribosomes | lysosomes |
This question discriminated well. The most common incorrect response was B, chosen by candidates who placed nucleoli before lysosomes.
A nucleolus (1–3 µm) is larger than a lysosome (0.2–0.5 µm), and ribosomes (≈25 nm) are the smallest. The correct answer was C.
Everything you need to revise smarter.
Questions about
Topical Past Paper?
Topical past papers are past paper questions grouped by syllabus topic instead of by exam sitting, so you can practise every question ever set on one topic in a row.
We cover the major A-Level and IGCSE boards, with questions sorted by topic for every paper. New subjects and papers are added regularly.
Yes — you can practise topical past papers for free. Premium unlocks every paper, subtopic filtering, examiner reports and difficulty information.
We use AI models to predict question difficulty. Some predictions may be inaccurate, and we keep improving them.
Every question is pulled from real past papers, tagged by year, season and paper variant so you always know exactly where it came from.
Study the right questions.
The grade follows.
No card. No email confetti. Just the practice tool your future self wishes you'd started with.