Biology JAMB Past Questions and Answers PDF

Are you preparing for Jamb? To ace 300+, you need PQ. So find the updated biology JAMB past questions PDF here, first make sure you read through to gain more insight as I will be reveling top 50 tough Biology JAMB Past questions and answers in this article. By the end, you should be able to practice 50 questions in 1 minute.

Why Biology JAMB Past Questions and Answers PDF Is a Game Changer

Let me be straightforward with you. Preparing for JAMB without past questions is like trying to find your way around a new city without a map.

You might eventually get there, but you will waste a lot of time going in the wrong direction. Past questions give you the map. They show you exactly where JAMB likes to go, what topics they keep returning to, and how they structure their questions.

Here is the truth about JAMB Biology. The exam has 40 questions, and you are expected to answer them within a limited time on a Computer Based Test (CBT) platform.

That means speed and accuracy are everything. You do not have the luxury of sitting and thinking for five minutes on one question. You need to recognise the question, recall the answer, and move on. The only way to build that level of familiarity is by practicing with real past questions repeatedly.

Research and student testimonials consistently show that students who incorporate past questions into their preparation score significantly higher than those who rely only on textbooks.

Some studies suggest the improvement can be as high as 20 to 30 percent. That gap could be the difference between admission and rejection.

Beyond scores, past questions also help you manage exam anxiety. When you have seen hundreds of similar questions before walking into the exam hall, nothing will shock you. You will sit down, see a familiar question pattern, and feel that quiet confidence that comes from solid preparation. That confidence alone can push your score higher.

Biology JAMB Past Questions and Answers PDF 

Now that you understand why past questions are so important, then you can get it below.

Note that this for education purpose only.

Sample Biology JAMB Past Questions From Recent and Older Exams

Nothing prepares you better than seeing the real thing. Below are selected sample questions drawn from authentic

JAMB Biology exams across different years. Go through them carefully, attempt each one before checking the answer, and pay attention to the pattern of how questions are framed.

From the 2024 JAMB Biology Exam

These questions focused heavily on foundational biochemistry and cell biology concepts.

1. The major building block of an organism is: A. Nitrogen B. Carbon C. Water D. Sulphur Answer: B. Carbon
2. The process by which plants lose water to the atmosphere is: A. Transpiration B. Guttation C. Translocation D. Evaporation Answer: A. Transpiration
3. The formation of cilia and flagella in living cells is carried out with the help of: A. Ribosome B. Lysosome C. Centriole D. Plastid Answer: C. Centriole
4. The food nutrient with the highest energy value is: A. Protein B. Carbohydrate C. Lipid D. Minerals Answer: C. Lipid

From the 2019 JAMB Biology Exam

These questions leaned toward botany and human sensory systems.

1. A plant which grows on another plant without apparent harm to the host plant is called: A. An epiphyte B. A saprophyte C. A parasite D. A predator Answer: A. An epiphyte
2. The process represented by 6CO2 + 6H2O producing C6H12O6 + 6O2 under sunlight and chlorophyll is: A. Respiration B. Photosynthesis C. Protein synthesis D. Transpiration Answer: B. Photosynthesis
3. In the photosynthesis equation above, the oxygen released is derived from: A. Chlorophyll B. Sunlight C. Atmosphere D. Water Answer: D. Water
4. One of the functions of xylem is: A. Manufacturing food B. Storing unused sugar C. Strengthening the stem D. Reducing loss of water Answer: C. Strengthening the stem
5. People suffering from myopia: A. Can see far away objects clearly B. Cannot see any object clearly C. Are colour blind D. Can see near objects clearly Answer: D. Can see near objects clearly

From the 2010 JAMB Biology Exam

Older questions tend to focus on cell structure, life cycles, and physiology.

1. Which of the following characterizes a mature plant cell? A. The cytoplasm fills up the entire cell space B. The nucleus is pushed to the centre C. The cell wall is made up of cellulose D. The nucleus is small and irregular in shape Answer: C. The cell wall is made up of cellulose
2. Which of the following is NOT a function of the nucleus? A. It controls life processes B. It translates genetic information for protein manufacture C. It stores hereditary information D. It is a reservoir of energy Answer: D. It is a reservoir of energy
3. The dominant phase in the life cycle of a fern is: A. Gametophyte B. Prothallus C. Sporophyte D. AntheridiumAnswer: C. Sporophyte
4. The primary structure responsible for pumping blood in the mammalian circulatory system is: A. Veins B. Right auricle C. Arteries D. Left ventricle Answer: D. Left ventricle

These samples already show you something important. JAMB Biology covers a wide range of topics from cellular biology all the way to ecology and physiology. No single area is ignored. Now that you can see the range, let us talk about the hardest questions you need to prepare for.

Top 50 Hardest Biology JAMB Questions You Must Know

These questions are the ones that trip up even well prepared students. They require deeper thinking, application of concepts, and precision. Go through each one seriously.

1. Which enzyme is responsible for the replication of DNA? A. DNA polymerase B. RNA polymerase C. Ligase D. Helicase Answer: A. DNA polymerase
2. The enzyme that unwinds the DNA double helix during replication is: A. Ligase B. Helicase C. Primase D. Topoisomerase Answer: B. Helicase
3. Which of the following is a correct description of crossing over? A. Exchange of genes between homologous chromosomes B. Movement of chromosomes to opposite poles C. Duplication of chromosomes D. Separation of sister chromatids Answer: A. Exchange of genes between homologous chromosomes
4. The term used to describe organisms that can survive in extremely salty environments is: A. Xerophytes B. Halophytes C. Hydrophytes D. Mesophytes Answer: B. Halophytes
5. In a food chain, the organisms that feed directly on producers are called: A. Decomposers B. Primary consumers C. Secondary consumers D. Tertiary consumers Answer: B. Primary consumers
6. Which blood group is considered the universal recipient? A. A B. B C. O D. AB Answer: D. AB
7. The universal donor blood group is: A. AB B. A C. O D. B Answer: C. O
8. Haemophilia is caused by a deficiency of: A. Red blood cells B. White blood cells C. Clotting factors D. PlateletsAnswer: C. Clotting factors
9. Sickle cell anaemia is caused by a mutation in which protein? A. Insulin B. Haemoglobin C. Albumin D. Fibrinogen Answer: B. Haemoglobin
10. The process by which mRNA is made from a DNA template is called: A. Translation B. Replication C. Transcription D. Transduction Answer: C. Transcription
11. Which of the following is an example of a vestigial structure in humans? A. Femur B. Appendix C. Cerebrum D. Tibia Answer: B. Appendix
12. The type of evolution where unrelated species develop similar traits due to similar environments is: A. Divergent evolution B. Coevolution C. Convergent evolution D. Parallel evolution Answer: C. Convergent evolution
13. Which part of the brain controls balance and coordination? A. Cerebrum B. Medulla oblongata C. Cerebellum D. Thalamus Answer: C. Cerebellum
14. The hormone responsible for regulating blood sugar levels is: A. Adrenaline B. Thyroxine C. Insulin D. CortisolAnswer: C. Insulin
15. Glucagon is produced by which cells in the pancreas? A. Beta cells B. Delta cells C. Alpha cells D. Acinar cellsAnswer: C. Alpha cells
16. The nitrogen cycle step where bacteria convert nitrates back to nitrogen gas is called: A. Nitrification B. Ammonification C. Denitrification D. Nitrogen fixation Answer: C. Denitrification
17. Which organelle is responsible for the production of ATP in eukaryotic cells? A. Ribosome B. Nucleus C. Mitochondria D. Golgi apparatus Answer: C. Mitochondria
18. The process of converting glucose to pyruvate is called: A. Krebs cycle B. Glycolysis C. Oxidative phosphorylation D. Fermentation Answer: B. Glycolysis
19. Which of the following is NOT found in prokaryotic cells? A. Cell wall B. Ribosomes C. Nucleus D. Plasma membrane Answer: C. Nucleus
20. The fluid mosaic model describes the structure of: A. The nucleus B. The cell wall C. The plasma membrane D. The endoplasmic reticulum Answer: C. The plasma membrane
21. Which type of bond holds complementary base pairs in DNA together? A. Covalent bonds B. Ionic bonds C. Hydrogen bonds D. Peptide bonds Answer: C. Hydrogen bonds
22. An organism that is heterozygous for a trait has: A. Two identical alleles B. Two different alleles C. No alleles for the trait D. Three alleles Answer: B. Two different alleles
23. The law that states alleles separate during gamete formation is called: A. Law of dominance B. Law of segregation C. Law of independent assortment D. Law of linkage Answer: B. Law of segregation
24. Which of the following is a secondary sexual characteristic in males? A. Presence of testes B. Growth of facial hair C. Production of sperm D. Presence of the Y chromosome Answer: B. Growth of facial hair
25. The hormone that stimulates milk production in nursing mothers is: A. Oestrogen B. Progesterone C. Prolactin D. Oxytocin Answer: C. Prolactin
26. Which of the following is an example of mutualism? A. A tick feeding on a dog B. Nitrogen fixing bacteria in legume roots C. A tapeworm in the human gut D. A vulture feeding on dead animals Answer: B. Nitrogen fixing bacteria in legume roots
27. The term biodiversity refers to: A. The number of ecosystems in the world B. The variety of life forms in a given area C. The number of food chains in a habitat D. The amount of biomass in an ecosystem Answer: B. The variety of life forms in a given area
28. Which part of the nephron is responsible for ultrafiltration? A. Loop of Henle B. Collecting duct C. Bowman’s capsule D. Distal convoluted tubule Answer: C. Bowman’s capsule
29. The site of gaseous exchange in the lungs is: A. Bronchi B. Trachea C. Alveoli D. Bronchioles Answer: C. Alveoli
30. Peristalsis refers to: A. The secretion of digestive enzymes B. The wave like muscular contraction that moves food through the gut C. The absorption of nutrients in the small intestine D. The production of bile in the liver Answer: B. The wave like muscular contraction that moves food through the gut
31. Which vitamin is produced by the body when exposed to sunlight? A. Vitamin A B. Vitamin C C. Vitamin D D. Vitamin K Answer: C. Vitamin D
32. The deficiency of Vitamin C leads to: A. Rickets B. Scurvy C. Night blindness D. Anaemia Answer: B. Scurvy
33. Which of the following organisms reproduces by binary fission? A. Amoeba B. Fern C. Mushroom D. HydraAnswer: A. Amoeba
34. The process by which water moves across a semi permeable membrane from low solute to high solute concentration is: A. Active transport B. Diffusion C. Osmosis D. Facilitated diffusion Answer: C. Osmosis
35. Turgor pressure in plant cells is caused by: A. Entry of salts into the cell B. Entry of water into the vacuole C. Exit of water from the cell D. Production of cellulose in the cell wall Answer: B. Entry of water into the vacuole
36. The enzyme that breaks down starch in saliva is: A. Lipase B. Protease C. Amylase D. Sucrase Answer: C. Amylase
37. Which of the following is NOT a function of the liver? A. Production of bile B. Detoxification of harmful substances C. Regulation of blood glucose D. Production of insulin Answer: D. Production of insulin
38. Which of the following is a characteristic of living organisms? A. Crystallisation B. Oxidation C. Irritability D. Rusting Answer: C. Irritability
39. Phototropism in plants is controlled by which hormone? A. Cytokinin B. Gibberellin C. Auxin D. Abscisic acidAnswer: C. Auxin
40. The removal of the apical bud in plants leads to: A. Increased height B. Increased lateral branching C. Reduced root growth D. Faster flowering Answer: B. Increased lateral branching
41. Which of the following best describes a niche? A. The physical location of an organism B. The role and position of an organism in its ecosystem C. The type of food an organism eats D. The geographic range of a species Answer: B. The role and position of an organism in its ecosystem
42. The ability of the skin to act as a sense organ is due to the presence of: A. Sweat glands B. Sebaceous glands C. Sensory nerve endings D. Melanin Answer: C. Sensory nerve endings
43. Which of the following is NOT a greenhouse gas? A. Carbon dioxide B. Methane C. Oxygen D. Water vapourAnswer: C. Oxygen
44. The process of converting ammonia to nitrites by bacteria is called: A. Denitrification B. Nitrification C. Ammonification D. Nitrogen fixation Answer: B. Nitrification
45. An organism that feeds on both plants and animals is called: A. Herbivore B. Carnivore C. Omnivore D. DetritivoreAnswer: C. Omnivore
46. Which of the following is a feature of aerobic respiration only? A. Production of lactic acid B. Takes place in the cytoplasm C. Produces a large amount of ATP D. Does not require oxygen Answer: C. Produces a large amount of ATP
47. Which type of reproduction produces genetically identical offspring? A. Sexual reproduction B. Asexual reproduction C. Cross pollination D. Fertilisation Answer: B. Asexual reproduction
48. The hormone that prepares the uterus for implantation is: A. Oestrogen B. Testosterone C. Progesterone D. FSHAnswer: C. Progesterone
49. Which of the following is an example of a saprophyte? A. Mushroom B. Mistletoe C. Tapeworm D. Tick Answer: A. Mushroom
50. The term used to describe the movement of materials from leaves to other parts of the plant through the phloem is: A. Transpiration B. Translocation C. Osmosis D. Diffusion Answer: B. Translocation

If you can confidently answer all of them without looking at the options, you are in excellent shape for exam day. Were you able to answer all? If so, comment what you experienced below.

Key Topics in the JAMB Biology Syllabus You Must Master

Getting the past questions is one thing. Knowing which topics they consistently test is another level of preparation entirely. Let me walk you through the core areas that appear most frequently in the Biology JAMB exam so that you can prioritise your study time intelligently.

Cell Biology and Organisation is always heavily represented. You need to understand the structure and function of all cell organelles, the differences between plant and animal cells, prokaryotic versus eukaryotic cells, and the processes of osmosis, diffusion, and active transport. These topics alone can account for as many as 8 to 10 questions in a single exam.

Genetics and Heredity is another high yield area. Mendelian genetics, sex linkage, codominance, mutations, and the molecular basis of inheritance all fall here. Students often struggle with genetics because it requires both understanding and calculation. Practice as many genetics based past questions as you can because the patterns repeat.

Ecology and Environment covers food chains, food webs, population dynamics, biomes, nutrient cycles, and environmental pollution. JAMB loves ecology questions because they test whether you can apply biological concepts to real world scenarios. Questions about the nitrogen cycle, carbon cycle, and water cycle appear almost every year.

Human Physiology covers the digestive system, circulatory system, respiratory system, excretory system, nervous system, and the endocrine system. Each of these systems has its own set of organs, functions, hormones, and diseases, all of which are fair game for JAMB.

Evolution and Adaptation rounds out the major topics. You need to understand Darwin’s theory of natural selection, Lamarck’s theory, evidence for evolution, and how organisms adapt to different environments. Questions on convergent evolution, divergent evolution, and vestigial structures are common here.

Botany and Plant Biology covers photosynthesis, transpiration, plant hormones, reproduction in flowering plants, and the classification of plants. Do not make the mistake of ignoring botany. It consistently appears in every JAMB Biology exam.

Classification of Living Things requires you to know the five kingdoms, the hierarchy of classification from kingdom all the way down to species, and the distinguishing features of major organism groups. Viruses, bacteria, fungi, protists, and all the major animal phyla are included here.

Once you have a solid grasp of these topics, go back to your past question PDFs and sort the questions by topic. You will immediately see which areas you are strong in and which ones need more work. That targeted approach is far more efficient than randomly going through questions without tracking your progress.

My personal Tips  Studying Biology JAMB Past Questions Effectively

Having the PDF is just the beginning. How you study matters just as much as what you study. Over the years, I have seen students download hundreds of past questions and still perform poorly because they studied them the wrong way. So here are the strategies that actually work.

Start with the JAMB Biology syllabus. Before you open a single past question paper, download the official JAMB Biology syllabus from the JAMB website. The syllabus outlines every topic that is examinable. Use it as your master checklist. Every time you study a topic, tick it off the list. This ensures you do not spend all your time on areas you are already strong in while neglecting your weak spots.

Set up a timed practice routine. The CBT exam requires you to answer 40 Biology questions in roughly 30 to 40 minutes. That means you have less than a minute per question. The only way to build that speed is through consistent timed practice. Every time you sit down with your past question PDF, set a timer. Do not pause, do not look things up mid practice. Train your brain to work under pressure.

Review wrong answers immediately. This is where most students go wrong. They check their score, feel good or bad about it, and move on. That is a wasted opportunity. Every wrong answer is a lesson. When you get a question wrong, go back and ask yourself three things. What did I think the answer was? Why was I wrong? What is the correct reasoning? Write this down. That process of self correction burns the concept into your memory far more effectively than just reading notes.

Use a physical notebook for difficult concepts. There are some topics in Biology that just refuse to stick no matter how many times you read them. For those topics, write them out by hand in a dedicated notebook. The act of writing by hand activates different memory pathways than reading on a screen. Draw diagrams, label them, and quiz yourself by covering the labels and trying to recall them.

Group study sessions with accountability. Find two or three serious study partners and schedule weekly sessions specifically for reviewing past questions. Take turns explaining answers to each other. Teaching a concept is one of the most powerful ways to solidify your own understanding. If you cannot explain why an answer is correct in simple terms, you do not fully understand it yet.

Use CBT practice platforms. Platforms like Awajis, JambPast, and others offer free online CBT simulations specifically for JAMB. These platforms present questions in the same format as the actual exam, complete with a countdown timer and automatic marking. Using these alongside your PDFs creates a comprehensive preparation system that covers both content knowledge and exam technique.

Track your progress week by week. Keep a simple score sheet. Write down your score every time you do a timed practice session. Over weeks, you should see a clear upward trend. If your scores are stagnant or declining in a particular topic area, that is your signal to go back to the textbook before doing more past questions. Past questions are for practice, not for learning new concepts from scratch.

Conclusion

Biology JAMB past questions and answers in PDF format are genuinely one of the most powerful preparation tools available to you right now.

Drop a comment below and let me know which Biology topic gives you the most trouble. I read every comment and I will be happy to point you in the right direction.

Also, share this article with a friend who is preparing for JAMB. You never know whose preparation you might transform with a single share.