JAMB Biology Past Questions and Answers 2026 (Free CBT Practice Test)

1. Which of the following organisms exhibits an organ level of organization

2. Which of the following typically contains the highest amount of water pollutant

3. Which of the following types of biological molecules is responsible for storing genetic information?

4. Which of the following types of biological molecules are responsible for catalyzing biochemical reactions?

5. The cell wall of a plant cell is made up of

6. The membrane of a vauole is called

7. The most abundant group of organisms in the animal kingdom is

8. Which of these lack a true nucleus?

9. Unicellular organisms are mostly found among:

10. The function of ribosomes in cells is:

11. The membrane surrounding the vacuole in plants is called:

12. Most cells in higher animals retain their power of cell division except:

13. Arthropods are distinguished from vertebrates because they possess:

14. Which of the following have no nuclear membrane?

15. The following are classes under phylum Arthropoda except

16. The function of trichocyst in Paramecium is

17. The following are seedless except

18. Which of the following distinguishes a plant cell from an animal cell?

18. Yellow fever is caused by

19. Feeding in fungus is by ___

20. Which of the following are thallophyte?

21. The organelle which eliminates water from the body of the protozoan is

22. Biosphere is best described as

1. The effect of the lack of vascular roots of a bryophyte is:

2. Bats and birds' wings show

3. Evolutionary trend can be estimated through

4. The most primitive among these is

5. . One of the most important driving forces for evolution is

1. What is the function of a long, narrow, and tubular beak found in some birds.

2. Which of the following insects has piercing and sucking mouthparts

3. Which group of vertebrates has a three-chambered heart and lays jelly-coated eggs in water?

4. Birds moving away from their habitat due to unfavourable climate conditions is an example of

5. Sharp claws and beaks are adaptations possessed by

6. The part of the fish body that is sensitive to vibration is:

7. The bird that probes for insects hidden in tree bark:

8. The light shading of the ventral part in fish is ……

9. The spider is different from the prawn in the possession of

10. The brown head in Agama lizard is an adaptation for

11. Territory formation in Agama lizard enhances

12. An example of animal that aestivate during unfavorable condition is

13. Terrestrial vertebrates respire with the aids of

1. In the diagram below, the function of the part labeled III is:

2. The vegetative part of a plant is:

3. Pneumatophores developed by white mangroves are used for:

4. What inorganic material is needed for photosynthesis?

5. The supporting tissues which are essential for young plants is

6. The part between the epidermis and pericycle in a stem is?

7. The male gamete in the plant is

8. Nutrients are absorbed from the soil by

9. The layer of dicot stem impermeable to liquids and gases is the

10. Which of the following fruit has marginal placentation?

1. Which type of cartilage is found in the external ear, epiglottis and larynx?

2. Which type of cartilage provides a smooth surface for joint movement and is commonly found in the ribs, trachea and bronchi?

3. The white layer of connective tissue protecting the eye is

4. The liquid component of the mammalian blood is

1. Which of the following is involved in the transportation of substances in plants.

2. Which of the following processes does not require energy (ATP) in living organisms?

3. Which part of the plant conducts water and mineral salts from the roots to other part?

4. Antibodies are found in

5. Which type of circulation is present in arthropods and mollusks

6. The ABO blood grouping antigens are found on the surface of

7. The mineral required for the formation of red blood cells in animal cells is

8. A plant cell is plasmolyzed as a result of

9. What is the term for the movement of molecules from an area of high concentration to an area of low concentration?

9. Digested food in the body is transported by:

10. Agglutination occurs when blood is passed from blood group:

11. When blood flows from the heart to the lungs and back to the heart, the circulation is

12. Which blood group lacks antigen?

13. Which blood type is large and nucleated?

14. The blood vessel that carries oxygenated blood to the kidney is

15. The xylem tissue is responsible for

16. The opening of the guard cells of the epidermis in plants is by the process of

17. The human heart is a/an

18. Plant cell is plasmolysed as a result of

19. The old non-functional red blood cells are transported to ___ and ___ for removal

1. In cellular respiration, which of the following serves as the final electron acceptor in the electron transport chain?

2. Which of the following best describes the function of a ribosome in a cell?

3. How do insects respire

4. What is the primary purpose of oxygen transported to all parts of the body during blood circulation

5. Which of these is not a characteristic of all living organisms?

6. Why is oxygen necessary for seed germination?

7. Air spaces are found in which structure of a plant?

8. Mitochondria function directly in

1. Which cell organelle is responsible for strong waste?

2. Which if the following is an excretory organ in insects?

3. What is the main function of the large intestine in humans?

4. What is the structure and functional unit of the kidney?

5. What is the excretory organ of the earthworm?

6. Which of the following uses flame cell as its organ of excretion?

7. Syphilis is caused by

8. Flame cell is an excretory organ in

9. The structure for excretion in insects is

10. Alkaloids are excretory products used to produce

11. The nephridium is used in which of the following organisms?

1. Which of the following reduces wear and tear on bones?

2. Which vertebra bears the weight of the body?

3. The appendicular skeleton is composed of the

4. The vertebra with a large centrum and that supports most of the body weight is

5. The structure that protects articulating surfaces of bones at a point to prevent it from being worn out is

1. Which of the following organisms is saprophytic?

2. Which of the following is a macronutrient for plants

3. What is the composition of sucrose

4. The presence of which enzyme in saliva initiates carbohydrate digestion?

5. Emulsification of fats takes place in the part labeled (diagram question available on our JAMB SIMULATION App)

6. Insectivorous plants trap and kill their prey to derive

7. The mode of nutrition in which digestion is extracellular is:

8. The highest energy level is found in:

9. Which of the following is the deficiency disease of vitamin?

9. The end product of protein digestion is

10. Excessive bleeding from an injury may be due to lack of vitamin

11. Night blindness results from the deficiency of

12. Which part in the diagram is the large intestine? (Diagram question)

13. Where does emulsification of fats take place? (Diagram question)

1. The immature fruits of opium poppy are

2. Inbreeding crossing refers to the breeding of:

3. The breeding of related species is known as:

4. The order of complete metamorphosis is

5. This diagram (available on our paid class represents the asexual reproduction in yeast; it is known as (see diagram) A. Binary

6. The removal of petal in a flower reduces the chance of

7. Why should a pregnant woman avoid taking excess drugs?

8. Which of the following is an internal condition necessary for seed germination?

9. Which of the following is correct regarding in vitro fertilization?

10. The dominant phase in the life cycle of a bryophyte is the

11. Which of the following disperses a termite colony?

1. What type of cells are found at apex of root and stems during growth characterized by constant division

2. Which of the following conditions promotes seed germination?

3. What is the term for the process by which an organism's cells become specialized to perform specific functions?

4. Which of the following promotes abscission?

5. In epigeal germination, the

1. Which of the following is an example of a reflex action

2. Which structure regulates the amount of light entering the eye?

3. Which part of the brain controls involuntary actions such as heartbeat and breathing? A, B. C. D.

4. What part of the brain is responsible for smell?

5. Which of the following is responsible mainly for the transmission of nerve impulses?

6. Which of the following is responsible for regulating an organism's body temperature?

7. The process by which an organism maintains a fairly stable internal environment despite changes in the external environment is called

9. Termites communicate by

10. What part of the brain controls the heart beat?

11. Intelligence, reasoning and memory is controlled by

12. . Which of the following is located at the base of the midbrain?

13. Which of the following provided surface for the attachment of proteins?

14. The olfactory lobe is connected to which organ?

1. Which of the following is a mutualistic relationship?

2. Yellow fever is transmitted by which vector?

3. An edaphic factor of growth of plants is:

4. Which of the following factors does not affect aquatic organisms?

5. The instrument above is for measuring (wind vane diagram — see diagram)

6. The following are abiotic components of the ecosystem except

1. What type of competition occurs when cows and goats graze on the same field of grasses

2. What type of biological association is represented by the relationship between becteria and protozoa in the rumen of cattle.

3. What is the relationship between cattle and cattle egret?

4. What is the relationship between zebra and lion?

5. Opium poppy produces:

6. The association between shark and remora fish is

7. The function of the mandibulate soldier termites is

8. Which of the castes of the honey bees defends the territory?

9. Which of the following organism is not a social insect?

10. Mycorrhiza refers to

11. The soldier termites differ from the workers termites by having

1. Which of these is a social insect?

2. Which of the following are likely to inhabit a new habitat as pioneers?

3. The instrument that measures the speed of the wind is known as

4. The specific role of a species coupled with its location is known as its

5. If 200 ants are found in a field with a total land area of 100 m², what is the population density of the ants?

6. Which of the following can lead to increase of size in population?

1. Which instrument is used to measure the transparency of water bodies?

2. What term describe the maximum number of organism that the resources in a habitat can support sustainably

3. Seaweeds and barnacles are common flora and fauna found in which of these habitats

4. Which of the following organisms can be found in the mangrove swamp?

5. An example of an Estuarine habitat is:

6. Plants in a mangrove swamp have:

7. The aphotic zone is characterized by:

8. The mixture of fresh water and sea water is called:

9. One of the following is associated with the estuarine habitat?

10. Which of these is the biggest game reserve in Nigeria?

1. Sudan Savannah is found in which part of Nigeria?

2. Which of the following is found in arid land?

3. Emergent trees are at _____ layer of the forest:

4. A tree growing with broad and evergreen leaves is likely located in:

5. The following are features of northern Guinea Savannah EXCEPT

6. Possession of breathing roots is for trees grown in

1. Which of the following soil samples is not water-logged and less aerated?

2. The soil type with the highest capillary action is

3. Soil conservation means

1. . Which of the following organisations promotes conservation of organisms?

2. The national park of Nigeria is located at:

3. A criminal can be traced through which of the following?

4. The growth of algae as a result of phosphate in water bodies is called

5. Which of the following is a microdecomposer?

6. The intermediate host of schistosoma is

7. Drinking of contaminated water could cause

8. The vector of the sleeping sickness disease parasite is

5. In which state in Nigeria is Kainji National Park located?

1. Which of the following is a physiological variation

2. Which of the following is an example of genetic variation?

3. Which of the following is an example of continuous variation?

4. The shape of the ear is a type of

5. The ability to move the ears without moving the head is

6. (i) fingerprint (ii) ability to roll the tongue (iii) weight (iv) blood group — Which of these is/are examples of discontinuous variation?

7. A sudden change in the genetic makeup of an organism is known as

1. How many chromosomes are present in a typical human male somatic cell.

2. What term describes the genetic makeup of an individual.

3. What are the repeating units of a very large DNA molecule made up of.

4. What is the right genotype combination for a man with blood group.

5. Which of the following genetic disorders is caused by nondisjunction during meiosis?

6. What is the biological significance of meiosis?

7. In a monohybrid cross between a tall plant (Tt) and a short plant (tt), the phenotypic ratio of the progeny will be

8. A character that is expressed in a female only when it is homozygous but expresses itself in the male always is known as

9. What is the term for the process by which an organism's genetic information is altered by external factors?

10. A man of AS genotype marries a woman of AS genotype, what is the probability of having a sickle cell anemia offspring?

11. Which of the following characteristics is used to produce disease resistant plant varieties?

12. If a heterozygous tall plant is crossed with a short plant, the ratio in the first filial generation is

13. The base of RNA that pairs with adenine

14. The change in genetic makeup is known as?

15. A mother is a carrier of haemophilia while the father has the trait. What is the probability of their offspring having haemophilia?

16. X Chromosome in females comes from

17. Which of the following is an advantage of inbreeding?

18. Which of the following blood groups can have homozygous and heterozygous form?

19. The probability of a woman producing X-chromosome is

20. If a man who is hemophilic marries a woman who is a carrier for hemophilia, what percentage of their children will be hemophiliac?

21. A character expressed in a female only when it is homozygous but expresses itself in the male always is

22. A visually impaired man marries a normal woman and they have four children; how many of their offspring will be blind?

23. The most accurate determination of paternity is by

24. What is the fingerprint diagram above most efficient for? (Diagram question available in class)

NO QUESTIONS

1. Who proposed the theory of use and disuse of body parts?

2. What is the correct order of progression in plant evolution?

3. What does the presence of tiny, non-functional hand and legs bones inside a whale’s body suggest about its evolutionary history.

4. Which of the following scientists is credited with the discovery of the theory of evolution through natural selection?

5. The soldier termite differs from the worker termite by

6. The principle of survival of the fittest is regarded as:

7. Organic evolution theory of natural selection was postulated by?

8. The theory of use and disuse was propounded by

WAEC Grammar Question

1. Choose the correct option