DeeepSolve Logo
DeeepSolve
Get app
JAMB 2020

2020 JAMB Biology Past Questions and Answers

The 2020 JAMB Biology past questions with answers: 39 objective questions from the 2020 paper in the DeeepSolve question bank, each with its answer behind "Show answer". Try each question before you check, then practise the paper as a timed JAMB-style CBT.

Past questions © the examination body (JAMB/WAEC/NECO). DeeepSolve is not affiliated with them. Rights holders: see /copyright.

Questions

  1. 1.

    Both recesssive and dominant characters are found

    1. A.on different chromosome in the cell
    2. B.at the same logus of a homologous chromosome
    3. C.at a different loci of a homologous chromosome
    4. D.on the same chromatid in a chromosome
    Show answer

    Answer: B. at the same logus of a homologous chromosome

    Get a step-by-step AI explanation in the app

  2. 2.

    For growth to occur in organisms, the rate of

    1. A.anabolism must exceed that of catabolism
    2. B.catabolism must exceed that of anabolism
    3. C.food storage must be low
    4. D.food storage must be high
    Show answer

    Answer: A. anabolism must exceed that of catabolism

    Get a step-by-step AI explanation in the app

  3. 3.

    The process by which a red blood cell placed in distilled water absorbs water until it burst and realease it's content into the surrounding is known as

    1. A.osmosis
    2. B.plasmolysis
    3. C.turgidity
    4. D.hemolysis
    Show answer

    Answer: D. hemolysis

    Get a step-by-step AI explanation in the app

  4. 4.

    The biological association that contributes directly to succession in a community is

    1. A.competition
    2. B.predation
    3. C.parasitism
    4. D.commensalism
    Show answer

    Answer: A. competition

    Get a step-by-step AI explanation in the app

  5. 5.

    Which of the following vertebrates has the most simple structured heart

    1. A.reptile
    2. B.fish
    3. C.mammal
    4. D.Amphibian
    Show answer

    Answer: B. fish

    Get a step-by-step AI explanation in the app

  6. 6.

    The probability of a baby being a boy or a girl depends on the contribution of the

    1. A.father's sex cells
    2. B.father's stomatic chromosome
    3. C.mother's sex cell
    4. D.mother's X-chromosome
    Show answer

    Answer: A. father's sex cells

    Get a step-by-step AI explanation in the app

  7. 7.

    The butterfly is of great economic importance because

    1. A.of it's use in scientific studies
    2. B.it sucks nectar from flowers
    3. C.it adds to the beauty of the environment
    4. D.it pollinates flowers of crops and other plants
    Show answer

    Answer: D. it pollinates flowers of crops and other plants

    Get a step-by-step AI explanation in the app

  8. 8.

    Use the diagram to answer the question. The structure labelled i is

    1. A.photosensitive
    2. B.radiosensitive
    3. C.chemoreceptive
    4. D.tactile
    Show answer

    Answer: A. photosensitive

    Get a step-by-step AI explanation in the app

  9. 9.

    Paternity disputes can most accurately be resolved through the use of

    1. A.blood group typing
    2. B.finger printing
    3. C.tongue rolling
    4. D.DNA Analysis
    Show answer

    Answer: D. DNA Analysis

    Get a step-by-step AI explanation in the app

  10. 10.This question needs a diagram, table or passage that we don't have yet, so it isn't shown.

  11. 11.

    The villus in the small intestine is significant because

    1. A.Increases the surface area for absorption
    2. B.increases the surface area for digestion
    3. C.assists in mixing digested food
    4. D.assists in filtering undigested food
    Show answer

    Answer: A. Increases the surface area for absorption

    Get a step-by-step AI explanation in the app

  12. 12.

    The ability of the eyes to focus on both near and distance objects is termed

    1. A.image formation
    2. B.refraction
    3. C.hypermetropia
    4. D.accommodation
    Show answer

    Answer: D. accommodation

    Get a step-by-step AI explanation in the app

  13. 13.

    Deamination occurs in the?

    1. A.Kidney
    2. B.Pancreas
    3. C.Spleen
    4. D.Liver
    Show answer

    Answer: D. Liver

    Get a step-by-step AI explanation in the app

  14. 14.

    Vaccination is carried out in order to

    1. A.check the production of poison
    2. B.increase the activities of white blood cells
    3. C.increase the number of red blood cells
    4. D.stimulate the production of anti-bodies
    Show answer

    Answer: D. stimulate the production of anti-bodies

    Get a step-by-step AI explanation in the app

  15. 15.

    The noticeable adaptation of the animal to it's aquatic habitat is the possession of

    1. A.webbed digits
    2. B.four limb
    3. C.wide mouth
    4. D.large eyes
    Show answer

    Answer: A. webbed digits

    Get a step-by-step AI explanation in the app

  16. 16.

    In which of the following does external fertilization take place?

    1. A.toad
    2. B.lizard
    3. C.bird
    4. D.cockroach
    Show answer

    Answer: A. toad

    Get a step-by-step AI explanation in the app

  17. 17.

    The hypha of rhizopus is said to be non-septate because it

    1. A.does not contain chloropyll
    2. B.has no cross wall
    3. C.is vacuoled
    4. D.stores oil globus
    Show answer

    Answer: B. has no cross wall

    Get a step-by-step AI explanation in the app

  18. 18.

    When bacteria swim from cold to warm regions, this is known as

    1. A.positive phototaxis
    2. B.negative phototaxis
    3. C.positive thermotaxis
    4. D.negative chemotaxis
    Show answer

    Answer: C. positive thermotaxis

    Get a step-by-step AI explanation in the app

  19. 19.

    The excretory structure in the earthworm is the

    1. A.malphighian tubule
    2. B.flame cell
    3. C.nephridium
    4. D.kidney
    Show answer

    Answer: C. nephridium

    Get a step-by-step AI explanation in the app

  20. 20.

    The only caste in the termite colony whose members can feed themselves are the

    1. A.workers
    2. B.reproductives
    3. C.soldiers
    4. D.nymphs
    Show answer

    Answer: A. workers

    Get a step-by-step AI explanation in the app

  21. 21.

    In which of the following vertebrates does the skin function as a respiratory surface

    1. A.rat
    2. B.lizard
    3. C.fish
    4. D.frog
    Show answer

    Answer: D. frog

    Get a step-by-step AI explanation in the app

  22. 22.This question needs a diagram, table or passage that we don't have yet, so it isn't shown.

  23. 23.

    The bright colours of the comb and feathers in the peacock are for?

    1. A.sex differentiation
    2. B.beauty
    3. C.courtship
    4. D.defence
    Show answer

    Answer: C. courtship

    Get a step-by-step AI explanation in the app

  24. 24.

    The process of walking is under the control of the part of the brain called

    1. A.optic lobe
    2. B.olfactory lobe
    3. C.cerebellum
    4. D.medulla oblongata
    Show answer

    Answer: C. cerebellum

    Get a step-by-step AI explanation in the app

  25. 25.

    What is the term used to describe biotic and abiotic factors in the environment of the organism?

    1. A.habitat
    2. B.biome
    3. C.ecosystem
    4. D.ecological niche
    Show answer

    Answer: C. ecosystem

    Get a step-by-step AI explanation in the app

  26. 26.

    In a population of living things, the parameters of size, height, weight and colours are examples of

    1. A.continuous variation
    2. B.non-heritable variation
    3. C.discontinuous variation
    4. D.physiological variation
    Show answer

    Answer: A. continuous variation

    Get a step-by-step AI explanation in the app

  27. 27.

    The smallest living organism which share the characteristics of both living and non-living matter are

    1. A.bacteria
    2. B.fungi
    3. C.viruses
    4. D.protozoa
    Show answer

    Answer: C. viruses

    Get a step-by-step AI explanation in the app

  28. 28.

    Which of the following waste products in plants is excreted through the stomata and lenticles?

    1. A.carbon dioxide
    2. B.alkaloids
    3. C.tannins
    4. D.anthoocyanins
    Show answer

    Answer: A. carbon dioxide

    Get a step-by-step AI explanation in the app

  29. 29.

    Use the table to answer the question. Which of the zones is likely to be a desert?

    1. A.i
    2. B.ii
    3. C.iii
    4. D.iv
    Show answer

    Answer: D. iv

    Get a step-by-step AI explanation in the app

  30. 30.

    Which of the following instruments is NOT used in measuring abiotic factors in any habitat?

    1. A.microscope
    2. B.thermometer
    3. C.hygrometer
    4. D.windvane
    Show answer

    Answer: A. microscope

    Get a step-by-step AI explanation in the app

  31. 31.

    Use the diagram to answer the question. The type of protective adaption exhibited by the animal is

    1. A.disruptive colouration
    2. B.flash colouration
    3. C.countershading colouration
    4. D.warning colouration
    Show answer

    Answer: D. warning colouration

    Get a step-by-step AI explanation in the app

  32. 32.

    A group of organism of different species living in a particular area is described as a

    1. A.colony
    2. B.community
    3. C.population
    4. D.niche
    Show answer

    Answer: B. community

    Get a step-by-step AI explanation in the app

  33. 33.

    The function of ribosome in cells is

    1. A.protein synthesis
    2. B.starch synthesis
    3. C.transport of material
    4. D.lipid storage
    Show answer

    Answer: A. protein synthesis

    Get a step-by-step AI explanation in the app

  34. 34.

    In an agricultural ecosystem, the biotic component consist of

    1. A.crops, pests and beneficial insects
    2. B.crops, temperature and humidity
    3. C.pests, beneficial insects and water
    4. D.crops, water and soil
    Show answer

    Answer: A. crops, pests and beneficial insects

    Get a step-by-step AI explanation in the app

  35. 35.

    The hormone which regulates the amount of glucose in the blood is called?

    1. A.Adrenalin
    2. B.Auxin
    3. C.Insulin
    4. D.Thyroxine
    Show answer

    Answer: C. Insulin

    Get a step-by-step AI explanation in the app

  36. 36.

    Use the diagram to answer the question. The process of water loss and intake indicated by the arrows labelled i and ii are respectively

    1. A.evaporation and osmosis
    2. B.osmosis and exhalation
    3. C.osmosis and diffusion
    4. D.urination and diffusion
    Show answer

    Answer: D. urination and diffusion

    Get a step-by-step AI explanation in the app

  37. 37.

    Floating microscopic heterotrophs are mostly grouped as

    1. A.phytoplankton
    2. B.zooplankton
    3. C.microbes
    4. D.nekton
    Show answer

    Answer: B. zooplankton

    Get a step-by-step AI explanation in the app

  38. 38.

    Use the diagram to answer the question The neural arch is labelled

    1. A.i
    2. B.ii
    3. C.iii
    4. D.iv
    Show answer

    Answer: B. ii

    Get a step-by-step AI explanation in the app

  39. 39.

    Epiphytes growing on the branches of trees provide an example of the relationship known as?

    1. A.parasitism
    2. B.commensalism
    3. C.saprophytism
    4. D.holophytism
    Show answer

    Answer: B. commensalism

    Get a step-by-step AI explanation in the app

Frequently asked questions