Biology is compulsory for JAMB candidates targeting Medicine, Pharmacy, Nursing, Biochemistry, Microbiology, Agricultural Science and Veterinary Medicine. A high score in JAMB Biology 2026 is essential for admission into these competitive programmes. This guide covers the complete syllabus, most-tested topics, worked past question examples with explanations, a 6-week study plan, and answers to the most frequently asked questions to help you score 70 and above out of 100.
JAMB Biology 2026: Exam Format
JAMB Biology contains 40 four-option multiple-choice questions at 2.5 marks each, totalling 100 marks. There is no negative marking — always answer every question. The full UTME session is 1 hour 45 minutes shared across all four subjects. Most strong candidates allocate 25–30 minutes to Biology, leaving adequate time for Use of English and their remaining subjects.
JAMB Biology 2026 Syllabus: Topic Areas and Weighting
| Topic Area | Exam Weight | Key Sub-topics |
|---|---|---|
| Genetics and Heredity | Very High | Monohybrid/dihybrid crosses, sex-linkage, mutation, DNA, protein synthesis |
| Cell Biology | High | Organelles, mitosis/meiosis, osmosis, diffusion, active transport |
| Ecology | High | Food chains/webs, nutrient cycles, ecosystems, conservation |
| Plant Biology | High | Photosynthesis, transpiration, plant hormones, reproduction |
| Animal Biology | High | Digestion, circulation, excretion, nervous/endocrine systems |
| Classification and Evolution | Moderate | Five kingdoms, major phyla, Darwin’s theory |
| Microorganisms and Disease | Moderate | Bacteria, viruses, fungi, disease transmission, immunity |
Most Frequently Tested JAMB Biology Topics
Based on analysis of past papers from 2015–2025: genetics questions (crosses, sex-linkage, mutation) appear in every paper and account for 20–25% of marks. Cell biology organelle identification appears without exception. Photosynthesis vs respiration contrast questions, ecology food chains, and organism classification by feature are each tested multiple times per paper. Mastering these five areas secures the majority of available marks before touching the remaining syllabus.
Worked Past Question Examples
Q1: Monohybrid Cross
TT (tall) crossed with tt (short) — what proportion of F2 offspring will be short? (A) ÂĽ (B) ½ (C) Âľ (D) All — Answer: A. F1 all Tt. F2: TtĂ—Tt → TT:Tt:Tt:tt = 1:2:1. Only tt = short = ÂĽ. Mendel’s Law of Segregation.
Q2: Cell Organelle
Which organelle produces ATP? (A) Ribosome (B) Golgi apparatus (C) Mitochondria (D) Nucleus — Answer: C. Mitochondria = site of aerobic respiration. Ribosomes make proteins; Golgi packages proteins; nucleus holds DNA.
Q3: Transpiration
Water loss from plant leaves through tiny pores is called: (A) Osmosis (B) Transpiration (C) Respiration (D) Diffusion — Answer: B. Transpiration = evaporation through stomata. Osmosis = water movement across semi-permeable membranes; diffusion = particles high to low concentration; respiration = ATP production.
Q4: Decomposers
Role of decomposers in an ecosystem: (A) Convert solar energy (B) Break down dead matter, recycle nutrients (C) Transfer energy producers to consumers (D) Fix atmospheric nitrogen — Answer: B. Decomposers (bacteria/fungi) break dead matter into inorganic compounds absorbed by plants. A = producers; C = consumers; D = nitrogen-fixing bacteria.
Q5: Sex-Linked Inheritance
A colour-blind man marries a carrier woman. Probability their son is colour blind? (A) 0% (B) 25% (C) 50% (D) 100% — Answer: C. Man X^bY × Carrier X^BX^b. Sons get Y from father; X from mother (50% X^B, 50% X^b). Sons inheriting X^b = colour blind = 50% of sons.
6-Week JAMB Biology Study Plan
| Week | Focus | Daily Target |
|---|---|---|
| 1 | Cell Biology | Label organelles; learn functions; 20 past questions |
| 2 | Genetics | Master Punnett squares; mono/dihybrid; 30 genetics questions |
| 3 | Plant Biology | Photosynthesis/transpiration diagrams; plant hormones; 20 questions |
| 4 | Animal Biology | Digestive, circulatory, nervous, endocrine systems; 25 questions |
| 5 | Ecology, Classification, Evolution | Food webs; nutrient cycles; classification table; 20 questions |
| 6 | Full paper revision | 3 complete JAMB Biology sections timed; review every error |
Frequently Asked Questions: JAMB Biology 2026
How many Biology questions are in JAMB 2026?
40 four-option MCQ questions at 2.5 marks each = 100 marks total. No negative marking — always select an answer. Your Biology score adds directly to Use of English, Chemistry, and Physics/Mathematics for your UTME total out of 400.
What Biology score do I need for Medicine?
Aim for 70–80/100 (28–32 correct). Medicine at top federal universities typically requires 280–320+ overall. A Biology score of 75+ gives a strong foundation. See our JAMB cut-off marks 2026 guide for university-specific thresholds.
Is JAMB Biology harder than WAEC Biology?
JAMB Biology is comparable in difficulty but tests recognition and discrimination across closely similar options rather than written explanations. Strong WAEC Biology preparation transfers well, but practise specifically with JAMB past questions to familiarise yourself with the question style.
What textbooks should I use?
Recommended: (1) New School Biology by H. Stone and C. Cozen; (2) Biology for Senior Secondary Schools by Fasasi and Adeleke; (3) JAMB Biology past question booklets 2015–2025; (4) CBT practice platforms replicating the JAMB computer interface.
Which university programmes require Biology in JAMB?
Medicine, Dentistry, Pharmacy, Nursing, Physiotherapy, Medical Laboratory Science, Biochemistry, Microbiology, Botany, Zoology, Agricultural Science, and Veterinary Medicine all require Biology. Engineering, Computer Science, and Law typically do not. Always confirm subject combinations for your programme before registering.
How is JAMB Biology scored?
Each correct answer earns 2.5 marks; wrong answers score zero (no deduction). Unanswered questions also score zero — always select your best option even under uncertainty. Your raw Biology score out of 100 is added directly to the other three subject scores for your UTME total.
Key Biological Processes to Memorise for JAMB 2026
JAMB Biology questions frequently test whether candidates can recall the correct term for a biological process or identify which organ/organelle performs a specific function. Here are the most critical process-function pairs to commit to memory before exam day:
- Photosynthesis: Occurs in chloroplasts; uses light energy, COâ‚‚, and water to produce glucose and oxygen. Light-dependent reactions occur in thylakoid membranes; light-independent (Calvin cycle) in stroma.
- Aerobic respiration: Occurs in mitochondria; glucose + oxygen → CO₂ + water + ATP (36–38 ATP per glucose molecule).
- Anaerobic respiration (in animals): Glucose → lactic acid + ATP (2 ATP). Occurs in muscle cells during intense exercise.
- Transpiration: Water loss through stomata driven by leaf-to-air water vapour concentration gradient. Stomata open during daytime (guard cells become turgid when water/light is available).
- Osmosis: Net movement of water molecules from high to low water potential (i.e., from dilute to concentrated solution) across a semi-permeable membrane.
- Active transport: Movement of substances against concentration gradient, requiring energy (ATP) and carrier proteins — e.g., absorption of glucose in gut villi, mineral uptake by root hair cells.
Score 70+ in JAMB Biology 2026 — Your Action Plan
Scoring 70 and above in JAMB Biology 2026 is entirely achievable with the right approach. The candidates who consistently score in this range are not necessarily the most naturally talented — they are the ones who have studied the right topics, practised enough past questions to recognise question patterns, and avoided the common errors that cost easy marks.
Follow the 6-week study plan in this guide. Begin with genetics and cell biology — together they represent nearly half of all available marks. Build your process-function memory using flashcards or a revision notebook. After covering the content, switch exclusively to past paper practice and review. For preparation across your other JAMB subjects, see our guide on JAMB Use of English 2026 and our complete JAMB UTME 2026 study guide.
Have a specific JAMB Biology topic giving you trouble? Drop your question in the comments — our education team will explain it clearly. Share this guide with every science candidate preparing for JAMB 2026.
Understanding Genetics: The Foundation of Your JAMB Biology Score
Genetics is the single highest-yielding topic in JAMB Biology. Candidates who invest time mastering the mechanics of inheritance — how traits are passed from parents to offspring — consistently outperform those who rely on general content coverage. Here is what you need to know at a deeper level:
- Alleles and genotype: Each characteristic is controlled by a pair of alleles — one inherited from each parent. Dominant alleles (written as capital letters) mask recessive alleles (lowercase). A homozygous individual has two identical alleles (TT or tt); a heterozygous individual has two different alleles (Tt).
- Phenotype vs genotype: JAMB frequently asks you to distinguish between these. Genotype = genetic makeup (TT, Tt, tt); phenotype = physical expression (tall or short). Two organisms with different genotypes (TT and Tt) can have the same phenotype (both tall).
- Incomplete dominance: Neither allele is fully dominant — the heterozygote shows a blended phenotype. Classic JAMB example: red flower (RR) × white flower (WW) → pink flower (RW). F2 produces 1 red : 2 pink : 1 white.
- Codominance: Both alleles are fully expressed simultaneously. Classic JAMB example: ABO blood group system, where alleles I^A and I^B are codominant and together produce blood group AB.
- Dihybrid crosses: When two traits are considered simultaneously, the F2 ratio is 9:3:3:1 (if both traits show simple dominance). Memorise this ratio — it appears regularly in JAMB past papers.
Ecology Concepts Every JAMB Biology Candidate Must Know
Ecology questions in JAMB Biology test both definitions and applied understanding of how ecosystems function. These are the concepts most likely to appear in your 2026 paper:
- Trophic levels: Energy flows through an ecosystem from producers (plants) → primary consumers (herbivores) → secondary consumers (carnivores) → tertiary consumers. Only about 10% of energy is transferred between each trophic level — the rest is lost as heat and metabolic waste.
- Biotic and abiotic factors: Biotic = living components of an ecosystem (plants, animals, bacteria, fungi). Abiotic = non-living components (temperature, rainfall, pH, light, soil composition). JAMB regularly asks candidates to classify factors correctly.
- Population growth curves: An S-shaped (sigmoid) curve shows logistic population growth with a carrying capacity (K) where birth rate equals death rate. A J-shaped curve shows exponential growth with no limiting factor — unrealistic in nature but tested as a concept.
- The nitrogen cycle: Nitrogen in the atmosphere (N₂) is fixed by nitrogen-fixing bacteria (Rhizobium in root nodules of legumes). Organic nitrogen is released through decomposition (ammonification) → nitrification (ammonia → nitrites → nitrates) → denitrification (nitrates → N₂). This full cycle is regularly tested in JAMB.
- Conservation: Reasons for wildlife conservation, threats to biodiversity (habitat destruction, pollution, overexploitation, invasive species), and conservation strategies (game reserves, national parks, ex-situ conservation) are commonly tested policy-knowledge questions.
Human Biology: High-Yield System Facts for JAMB 2026
Questions on human body systems appear in every JAMB Biology paper. Here are the highest-yield facts across the most commonly tested systems:
- Digestive system: Amylase breaks down starch to maltose (begins in mouth, saliva). Protease breaks down proteins to amino acids. Lipase breaks down fats to fatty acids and glycerol. Absorption of nutrients mainly occurs in the small intestine (ileum) via villi and microvilli. Water is reabsorbed in the large intestine (colon).
- Circulatory system: The heart has four chambers — right atrium and right ventricle (pulmonary circuit, deoxygenated blood); left atrium and left ventricle (systemic circuit, oxygenated blood). Arteries carry blood away from the heart; veins carry blood toward the heart. Capillaries are the site of nutrient and gas exchange with tissues.
- Excretory system: The kidney filters blood and produces urine. The functional unit is the nephron — consisting of Bowman’s capsule, glomerulus, proximal/distal convoluted tubules, and loop of Henle. Urea is the main nitrogenous waste product in mammals, formed in the liver from excess amino acids.
- Nervous system: The central nervous system (brain and spinal cord) coordinates all body functions. Neurons transmit electrical impulses. A reflex arc (receptor → sensory neuron → relay neuron → motor neuron → effector) bypasses the brain for rapid involuntary responses — classic JAMB topic.
