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Key Facts: SPM Biology Exam

SPM Biology carries subject code 4551 and is an elective science under the KSSM curriculum (Lembaga Peperiksaan Malaysia).

Paper 1 (4551/1) consists of 40 objective multiple-choice questions worth 40 marks, completed in 1 hour 15 minutes.

SPM Biology is assessed in three papers: Paper 1 objective, Paper 2 structured and essay, and Paper 3 practical (Ujian Amali).

SPM subjects are graded on a 10-band scale from A+ down to G, where G is the minimum pass and C is a credit (kepujian).

The syllabus covers the full Form 4 (15 chapters) and Form 5 (13 chapters) of KSSM Biology, from cells to genetic technology.

SPM is administered by Lembaga Peperiksaan Malaysia under the Ministry of Education Malaysia (Kementerian Pendidikan Malaysia).

Candidates from government and government-aided MOE schools sit SPM Biology without a separate exam fee, as it is state-funded.

The 2025/2026 SPM reform cut the minimum number of compulsory subjects but left the Biology (4551) three-paper format unchanged.

An elective KSSM science assessed in three papers (40-question objective Paper 1, structured-plus-essay Paper 2, and a practical Paper 3), covering the full Form 4 and Form 5 Biology syllabus and graded A+ to G.

Sample SPM Biology Practice Questions

Try these sample questions to review concepts for the SPM Biology exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1In SPM Biology, which organelle is described as the site of aerobic respiration where ATP is produced and is most abundant in metabolically active cells such as muscle and liver cells?

A.Ribosome

B.Golgi apparatus

C.Mitochondrion

D.Lysosome

Explanation: The mitochondrion is the site of aerobic respiration, where glucose is fully oxidised in the presence of oxygen to release large amounts of ATP. Cells with high energy demands, such as muscle and liver cells, contain many mitochondria to meet their ATP requirements.

2A plant cell and an animal cell are compared under the microscope. Which structure is present in the plant cell but absent in the animal cell?

A.Plasma membrane

B.Nucleus

C.Cytoplasm

D.Cell wall made of cellulose

Explanation: Plant cells have a rigid cell wall made of cellulose outside the plasma membrane that gives shape and mechanical support; animal cells lack a cell wall. Chloroplasts and a large central vacuole are also unique to plant cells in the KSSM syllabus.

3A piece of fresh potato is placed in a concentrated salt solution. After 30 minutes the potato becomes soft and limp. Which process best explains this observation?

A.Osmosis: water moves out of the potato cells into the hypertonic solution

B.Active transport: salt is pumped into the cells using ATP

C.Simple diffusion: salt diffuses out of the cells

D.Endocytosis: the cells engulf the salt solution

Explanation: The salt solution is hypertonic to the potato cell sap, so water moves out of the cells across the partially permeable plasma membrane by osmosis, from high to low water potential. The cells become flaccid (plasmolysed), making the potato soft and limp.

4Which transport mechanism across the plasma membrane requires both a carrier protein and energy in the form of ATP, and can move solutes against their concentration gradient?

A.Simple diffusion

B.Active transport

C.Facilitated diffusion

D.Osmosis

Explanation: Active transport uses carrier proteins and energy from ATP to pump solutes from a region of lower concentration to a region of higher concentration, against the gradient. The sodium-potassium pump in nerve cells and mineral ion uptake by root hair cells are common KSSM examples.

5Which test reagent and result correctly indicate the presence of reducing sugar in a food sample?

A.Iodine solution turns from brown to blue-black

B.Biuret reagent turns from blue to violet

C.Benedict's solution turns from blue to brick-red on heating

D.Ethanol emulsion test produces a white emulsion

Explanation: Reducing sugars such as glucose reduce the copper(II) ions in Benedict's solution when heated, forming a brick-red precipitate of copper(I) oxide; the colour change is blue to green to yellow to brick-red. This is a standard KSSM food test.

6Proteins are polymers built from monomers joined by peptide bonds. What is the basic monomer unit of a protein?

A.Glucose

B.Fatty acid

C.Nucleotide

D.Amino acid

Explanation: Proteins are made of amino acid monomers linked by peptide bonds formed during condensation reactions. The sequence and folding of amino acids determine the specific three-dimensional shape and function of each protein.

7In an experiment, amylase is mixed with starch solution at different pH values. Enzyme activity is highest at pH 7 and almost zero at pH 3. What does this demonstrate about salivary amylase?

A.It has an optimum pH around neutral and is denatured by strong acid

B.It works best in strongly acidic conditions like the stomach

C.It is not affected by pH changes

D.It is permanently activated at low pH

Explanation: Each enzyme has an optimum pH at which its active site shape and catalytic activity are maximal; salivary amylase works best near pH 7 in the mouth. At very low pH the enzyme's structure is altered (denatured), so activity drops sharply, as shown by the near-zero activity at pH 3.

8According to the lock-and-key model of enzyme action, why is an enzyme usually specific to only one type of substrate?

A.Enzymes are used up during the reaction so each works once

B.The shape of the active site is complementary to a specific substrate

C.Each enzyme contains the substrate within its structure

D.Enzymes raise the activation energy of only one reaction

Explanation: In the lock-and-key model, the active site of an enzyme has a specific three-dimensional shape that fits only a substrate with a complementary shape, forming an enzyme-substrate complex. This complementary fit explains enzyme specificity.

9A diploid human cell with 46 chromosomes undergoes mitosis. How many chromosomes will each daughter cell contain immediately after division?

A.23

B.92

C.46

D.12

Explanation: Mitosis produces two genetically identical diploid daughter cells, each with the same chromosome number as the parent cell. A human parent cell with 46 chromosomes therefore yields daughter cells with 46 chromosomes each.

10Which statement correctly distinguishes meiosis from mitosis?

A.Meiosis produces two identical diploid cells for growth

B.Meiosis occurs in all body cells for repair

C.Meiosis does not change the chromosome number

D.Meiosis halves the chromosome number and produces four genetically varied cells

Explanation: Meiosis is a reduction division that halves the chromosome number, forming four haploid gametes that are genetically varied due to crossing over and independent assortment. This genetic variation is essential for sexual reproduction.

About the SPM Biology Exam

SPM Biology (subject code 4551) is an elective science under the KSSM curriculum, sat at the end of Form 5 by students in the science stream. It is examined in three papers: Paper 1 (4551/1) with 40 objective multiple-choice questions, Paper 2 (4551/2) with structured short-answer and essay questions, and Paper 3 (4551/3), the school-conducted practical assessment (Ujian Amali). The syllabus spans the full Form 4 (15 chapters) and Form 5 (13 chapters) content, from cells, enzymes and human physiology to plant physiology, ecology, genetics and biotechnology. Results are reported as a single grade on the 10-band A+ to G scale, where G is the minimum pass and C or above counts as a credit. The 2025/2026 SPM reform reduced the minimum number of compulsory subjects a candidate must sit but did not change the Biology paper format.

Exam sponsor: Lembaga Peperiksaan Malaysia (Malaysian Examinations Board), Kementerian Pendidikan Malaysia. The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Questions

100 questions

Time Limit

Paper 1: 1 hour 15 minutes (40 MCQ); plus Paper 2 (structured and essay) and Paper 3 (practical)

Passing Score

Single subject grade on the A+ to G scale; G is the minimum pass and C or above is a credit (kepujian). Boundaries are norm-referenced and not published.

Exam / Certification Fees

No separate fee for candidates registered through government and government-aided MOE schools; private candidates pay a per-subject registration fee set by Lembaga Peperiksaan Malaysia.

Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Official sources

Lembaga Peperiksaan Malaysia (Malaysian Examinations Board), Kementerian Pendidikan Malaysia: official exam information

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

16%

Cells, Transport, Biomolecules and Enzymes

Cell structure, movement of substances across the membrane, biomolecules, metabolism and enzymes, and cell division (mitosis and meiosis).

18%

Respiration, Nutrition and Human Transport

Cellular respiration, respiratory systems, the human digestive system and balanced diet, and the blood and circulatory system.

15%

Immunity, Coordination, Homeostasis, Support

Immunity, nervous and endocrine coordination, the eye, homeostasis and the urinary system, plus support and movement.

13%

Human and Plant Reproduction

Human reproduction, fertilisation and development, and reproduction in flowering plants including pollination and fruit formation.

18%

Plant Physiology and Adaptations

Plant tissues and growth, leaf structure, photosynthesis, transport in plants, plant responses and habitat adaptations.

11%

Ecology and Environmental Sustainability

Biodiversity, ecosystems, food chains, nutrient cycles, energy flow and environmental sustainability.

Inheritance, Variation and Genetic Technology

Mendelian inheritance, sex linkage, variation, mutation, DNA structure and genetic engineering.

Preparing for the SPM Biology Exam

What You Need to Know

Passing score: Single subject grade on the A+ to G scale; G is the minimum pass and C or above is a credit (kepujian). Boundaries are norm-referenced and not published.
Exam length: 100 questions
Time limit: Paper 1: 1 hour 15 minutes (40 MCQ); plus Paper 2 (structured and essay) and Paper 3 (practical)
Exam / certification fees: No separate fee for candidates registered through government and government-aided MOE schools; private candidates pay a per-subject registration fee set by Lembaga Peperiksaan Malaysia. Official sources

Using Our Practice Resources

Work through all 100 available questions
Review every answer and explanation
Track weak areas and revisit them
Use our AI tutor for tough concepts

SPM Biology: Suggested Study Strategy

1Master the standard food tests early: Benedict's solution (brick-red) for reducing sugar, iodine (blue-black) for starch, Biuret (violet) for protein and the alcohol-emulsion test (white emulsion) for lipid.

2Learn the word equations for aerobic respiration and photosynthesis until they are automatic, and be clear on how anaerobic respiration differs in humans (lactic acid) and in yeast (ethanol).

3Draw and label key diagrams repeatedly: the nephron, the heart, the alveolus, the reflex arc, a leaf cross-section and a flower, because Paper 2 rewards accurate labelled diagrams.

4Practise genetics crosses using Punnett squares for monohybrid crosses, sex determination, sex linkage and ABO blood groups so you can give exact genotype and phenotype ratios.

5For Paper 3 (Ujian Amali), drill how to state the manipulated, responding and controlled variables, write hypotheses and inferences, and tabulate data correctly.

6Compare and contrast frequently tested pairs, such as mitosis versus meiosis, xylem versus phloem, and active transport versus diffusion, in clear tables.

7Work through past-year and trial papers from recent years, then review the Lembaga Peperiksaan Kupasan Mutu Jawapan (KMJ) guidance to learn the exact keywords examiners expect.

Frequently Asked Questions

How many papers does SPM Biology have and what is the format?

SPM Biology (4551) has three papers. Paper 1 (4551/1) is 40 objective multiple-choice questions worth 40 marks in 1 hour 15 minutes. Paper 2 (4551/2) is structured short-answer plus essay questions. Paper 3 (4551/3) is the school-conducted practical assessment (Ujian Amali).

How is SPM Biology graded?

Each SPM subject is reported as a single grade on the 10-band scale A+, A, A-, B+, B, C+, C, D, E and G. Grade G is the minimum pass, while C and above counts as a credit (kepujian) used for college and matriculation entry. The grade boundaries are norm-referenced and not made public.

Is there a fee to sit SPM Biology?

Candidates registered through government and government-aided MOE schools do not pay a separate exam fee, because SPM is funded by the Ministry of Education Malaysia. Private (calon persendirian) candidates pay a per-subject registration fee set by Lembaga Peperiksaan Malaysia.

What topics are covered in SPM Biology?

The syllabus covers all of Form 4 (15 chapters) and Form 5 (13 chapters) of KSSM Biology, including cells, transport, enzymes, respiration, nutrition, human physiology, plant physiology, photosynthesis, ecology, inheritance, variation and genetic technology.

Did the 2025/2026 SPM reform change the Biology exam?

The SPM 2025/2026 reform reduced the minimum number of compulsory subjects a candidate must sit but did not change the Biology (4551) paper format. Biology remains an elective science under KSSM with the same three-paper structure of objective, structured/essay and practical papers.

Who administers SPM Biology?

SPM is administered by Lembaga Peperiksaan Malaysia (the Malaysian Examinations Board) under Kementerian Pendidikan Malaysia (the Ministry of Education). It is sat by Form 5 students in MOE-registered schools and approved examination centres.

In which language is SPM Biology sat?

SPM Biology question papers are provided in Malay (Biologi) and, for relevant streams, in English. Many candidates answer the science papers bilingually depending on their school's medium of instruction.

Free Practice Questions for SPM Biology

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