SPM Biology 2026: there's no shortcut, but there is a smarter order
We matched 520 Biology Paper 1 questions from 13 trial papers of 2026 to the 28 KSSM chapters. Each chapter is only 2.5% to 4.8% of the questions, so topic spotting doesn't work. Here's how to order your revision using the data.
Cerdek Team7 min read
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Biology has 28 chapters across Form 4 and Form 5. When time gets tight, the urge to "spot" a few chapters is strong. We wanted to know if that's a sensible strategy, so we counted.
We took 13 Biology trial papers from 2026 (11 states, plus MRSM and school papers) and matched every one of the 520 Paper 1 questions to its KSSM chapter and subtopic.
The answer is pretty firm: in Biology, spotting doesn't pay. The questions are spread almost evenly. But a handful of subtopics turn up again and again, and that's where the easy marks are.
The short answer
- No chapter dominates. The most-tested chapter (Transport in Humans and Animals) is only 4.8% of questions, the least-tested 2.5%. That's less than one question per paper between them.
- It takes 12 chapters to cover half the questions. Compare that with Chemistry, where 5 do it.
- Form 4 and Form 5 are almost even: 54% against 46%.
- Two subtopics appear in 9 papers out of 10: Community and Ecosystem (F5 9.1) and Adaptations of Plants (F5 7.1).
If you don't have much time left
A week left? Don't pick chapters. Pick question types. Biology Paper 1 leans heavily on diagrams (label the structure, name the process) and comparisons (mitosis versus meiosis, xylem versus phloem). Make one comparison sheet and one diagram sheet per form.
Three days left? Get the six "8 to 9 in 10" subtopics below solid, then sweep the top 12 chapters in the table with objective questions.
The night before? Reread the terms that sound alike: hypotonic/hypertonic, plasmolysis/crenation, homozygous/heterozygous. A lot of Biology objective questions are built to test exactly these.
Every chapter, ranked (2026 trial papers)
"Qs/paper" is the average number of questions from that chapter in one 40-question paper.
| # | Chapter | % of Qs | Qs/paper |
|---|---|---|---|
| 1 | F4 Ch. 10 Transport in Humans and Animals | 4.8% | 1.9 |
| 2 | F4 Ch. 9 Nutrition and the Human Digestive System | 4.6% | 1.8 |
| 3 | F4 Ch. 3 Movement of Substances Across a Plasma Membrane | 4.5% | 1.8 |
| 4 | F4 Ch. 12 Coordination and Response in Humans | 4.3% | 1.7 |
| 5 | F5 Ch. 2 Leaf Structure and Function | 4.2% | 1.6 |
| 6 | F5 Ch. 11 Inheritance | 4.1% | 1.6 |
| 7 | F5 Ch. 6 Sexual Reproduction in Flowering Plants | 4.1% | 1.6 |
| 8 | F5 Ch. 12 Variation | 4.0% | 1.6 |
| 9 | F5 Ch. 9 Ecosystem | 3.9% | 1.5 |
| 10 | F4 Ch. 15 Sexual Reproduction, Development and Growth | 3.9% | 1.5 |
| 11 | F5 Ch. 3 Nutrition in Plants | 3.9% | 1.5 |
| 12 | F5 Ch. 4 Transport in Plants | 3.9% | 1.5 |
| 13 | F4 Ch. 6 Cell Division | 3.8% | 1.5 |
| 14 | F4 Ch. 11 Immunity in Humans | 3.7% | 1.5 |
| 15 | F4 Ch. 8 Respiration in Humans and Animals | 3.6% | 1.4 |
| 16 | F4 Ch. 2 Cell Biology and Organisation | 3.3% | 1.3 |
| 17 | F4 Ch. 14 Support and Movement in Humans and Animals | 3.3% | 1.3 |
| 18 | F5 Ch. 5 Response in Plants | 3.3% | 1.3 |
| 19 | F4 Ch. 5 Metabolism and Enzymes | 3.2% | 1.3 |
| 20 | F5 Ch. 1 Organisation of Plant Tissues and Growth | 3.1% | 1.2 |
| 21 | F5 Ch. 8 Biodiversity | 3.1% | 1.2 |
| 22 | F4 Ch. 13 Homeostasis and the Human Urinary System | 3.0% | 1.2 |
| 23 | F5 Ch. 13 Genetic Technology | 2.9% | 1.1 |
| 24 | F5 Ch. 10 Environmental Sustainability | 2.9% | 1.1 |
| 25 | F4 Ch. 1 Introduction to Biology and Laboratory Rules | 2.7% | 1.1 |
| 26 | F5 Ch. 7 Adaptations of Plants | 2.7% | 1.1 |
| 27 | F4 Ch. 4 Chemical Composition in a Cell | 2.6% | 1.0 |
| 28 | F4 Ch. 7 Cellular Respiration | 2.5% | 1.0 |
Look how close the percentages are. From 1st to 28th the range is just 2.3 percentage points. That's why this ranking is most useful for deciding the order you revise in, not for choosing chapters to leave out.
Subtopics that turn up in almost every paper
The count below is how many papers (out of every 10) had at least one question from that subtopic.
- F5 9.1 Community and Ecosystem · 9 in 10 papers. Food chains and webs, trophic levels, and biotic interactions: mutualism, commensalism, parasitism, predation.
- F5 7.1 Adaptations of Plants · 9 in 10 papers. Xerophytes (spiny leaves, sunken stomata), hydrophytes (aerenchyma) and halophytes. Usually a picture, and you name the adaptation.
- F4 7.3 Fermentation · 8 in 10 papers. Yeast makes ethanol + CO₂, muscle makes lactic acid. Remember fermentation releases far less energy than aerobic respiration.
- F5 11.4 Inheritance in Humans · 8 in 10 papers. ABO blood groups (multiple alleles) and sex-linked inheritance (colour blindness, haemophilia).
- F5 3.1 Main Inorganic Nutrients · 8 in 10 papers. N, P, K and Mg and their deficiency symptoms. Mg is part of chlorophyll, so a shortage causes chlorosis.
- F4 14.2 Musculoskeletal System of Humans · 8 in 10 papers. Antagonistic muscles (biceps and triceps), types of joints, and tendons versus ligaments.
Mistakes we keep seeing
- Direction of osmosis. Water moves from a hypotonic to a hypertonic solution. A plant cell in a hypertonic solution plasmolyses; a red blood cell crenates.
- Mitosis versus meiosis. Meiosis gives four genetically different haploid cells. Crossing over happens in prophase I, never in mitosis.
- Tendons and ligaments. Tendon: muscle to bone. Ligament: bone to bone.
- Photosynthesis versus respiration on a graph. At the compensation point, the rate of photosynthesis equals the rate of respiration. It isn't zero.
- "NOT" questions. Biology has lots of questions that list four statements and ask which is not a feature of something. Underline that word.
How we counted, and what it can't tell you
The data comes from 13 Biology Paper 1 trial papers from 2026 (state, MRSM and school papers) in Cerdek's question bank: 520 objective questions in all. Each question was matched to a subtopic of the KSSM Form 4 and 5 Biology textbooks. A question touching two subtopics counts as half for each. 514 of the 520 questions could be matched.
The limits:
- These are trial papers, not real SPM papers. They follow the SPM format, but this isn't a prediction of the questions.
- Paper 1 (objective) only.
- In Biology the gaps between chapters are tiny, so don't read too much into a difference of one or two places.
You can see the same analysis, by year and by form, in the Topic Insights feature of the Cerdek app.
Frequently asked questions
Which Biology chapter came up most in the 2026 SPM trial papers?
Transport in Humans and Animals (Form 4, Chapter 10) with 4.8% of questions, followed by Nutrition and the Human Digestive System (4.6%) and Movement of Substances Across a Plasma Membrane (4.5%). But the gaps are tiny: even the least-tested chapter has 2.5%. Based on 520 questions from 13 trial papers of 2026.
Can I just spot a few Biology chapters?
It isn't a good idea. In the 2026 trial papers it took 12 of the 28 chapters to cover half the questions, and each chapter gave about 1 to 2 questions per paper. Leaving out several chapters can cost you a lot of questions at once.
Which Biology subtopics come up most often?
Community and Ecosystem (F5 9.1) and Adaptations of Plants (F5 7.1) appeared in 9 out of 10 trial papers of 2026. Fermentation, Inheritance in Humans, Main Inorganic Nutrients and the Musculoskeletal System of Humans appeared in about 8 out of 10.
Is this the same as the real SPM questions?
No. It is based on state and school trial papers written in the SPM format. Use it to plan your revision order, not to guess questions.
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