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JAMB UTME 2020

JAMB Biology 2020 past questions

7 objective questions from the 2020 JAMB Biology paper. Answer each one, then reveal the answer and explanation.

All JAMB Biology past questions

  1. Question 1

    Transport in animals

    Which blood vessel carries oxygenated blood from the lungs to the heart?

    1. Option A: Pulmonary artery
    2. Option B: Pulmonary vein
    3. Option C: Aorta
    4. Option D: Vena cava
    Show the answer to question 1

    Answer: B, Pulmonary vein

    The pulmonary vein is the only vein that carries oxygenated blood.

  2. Question 2

    Classification

    Identify the fish among the following animals.

    1. Option A: duck
    2. Option B: mudskipper
    3. Option C: lizard
    4. Option D: frog
    Show the answer to question 2

    Answer: B, mudskipper

    The mudskipper is a fish (class Pisces).

  3. Question 3

    Ecology

    Which vegetation zone in Nigeria has the highest rainfall?

    1. Option A: Sudan savanna
    2. Option B: Tropical rainforest
    3. Option C: Sahel savanna
    4. Option D: Guinea savanna
    Show the answer to question 3

    Answer: B, Tropical rainforest

    The southern rainforest belt is the wettest.

  4. Question 4

    Genetics

    In humans, the allele for normal pigmentation (A) is dominant over the allele for albinism (a). What is the expected phenotypic ratio of the offspring of a cross between Aa and Aa parents?

    1. Option A: 3 normal pigmentation : 1 albinism
    2. Option B: 1 normal pigmentation : 1 albinism
    3. Option C: All normal pigmentation
    4. Option D: All albinism
    Show the answer to question 4

    Answer: A, 3 normal pigmentation : 1 albinism

    Aa × Aa gives three offspring with at least one A to every aa: 3 : 1.

  5. Question 5

    Genetics

    In fruit flies, the allele for normal wings (N) is dominant over the allele for vestigial wings (n). What is the expected phenotypic ratio of the offspring of a cross between Nn and nn parents?

    1. Option A: 3 normal wings : 1 vestigial wings
    2. Option B: All normal wings
    3. Option C: All vestigial wings
    4. Option D: 1 normal wings : 1 vestigial wings
    Show the answer to question 5

    Answer: D, 1 normal wings : 1 vestigial wings

    Nn × nn gives equal numbers of Nn and nn: 1 : 1.

  6. Question 6

    Transport

    The loss of water vapour from the leaves of a plant is

    1. Option A: guttation
    2. Option B: respiration
    3. Option C: transpiration
    4. Option D: osmosis
    Show the answer to question 6

    Answer: C, transpiration

    That is the definition of transpiration.

  7. Question 7

    Cell biology

    Which organelle contains digestive enzymes?

    1. Option A: Lysosome
    2. Option B: Ribosome
    3. Option C: Centrosome
    4. Option D: Plastid
    Show the answer to question 7

    Answer: A, Lysosome

    Lysosomes hold hydrolytic enzymes.

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