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JAMB UTME 2023

JAMB Biology 2023 past questions

5 objective questions from the 2023 JAMB Biology paper. Answer each one, then reveal the answer and explanation.

All JAMB Biology past questions

  1. Question 1

    Excretion and respiration

    Flatworms such as Planaria excrete through

    1. Option A: nephridia
    2. Option B: flame cells
    3. Option C: Malpighian tubules
    4. Option D: kidneys
    Show the answer to question 1

    Answer: B, flame cells

    Flame cells remove waste in flatworms.

  2. Question 2

    Reproduction

    In humans, fertilisation normally takes place in the

    1. Option A: uterus
    2. Option B: vagina
    3. Option C: oviduct
    4. Option D: ovary
    Show the answer to question 2

    Answer: C, oviduct

    Sperm meet the ovum in the oviduct (fallopian tube).

  3. Question 3

    Nutrition

    Which enzyme is found in saliva?

    1. Option A: Pepsin
    2. Option B: Trypsin
    3. Option C: Ptyalin
    4. Option D: Lipase
    Show the answer to question 3

    Answer: C, Ptyalin

    Ptyalin (salivary amylase) starts starch digestion in the mouth.

  4. Question 4

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

    Answer: B, 3 normal wings : 1 vestigial wings

    Nn × Nn gives three offspring with at least one N to every nn: 3 : 1.

  5. Question 5

    Classification

    Which of the following animals is a reptile?

    1. Option A: tortoise
    2. Option B: dolphin
    3. Option C: hen
    4. Option D: caecilian
    Show the answer to question 5

    Answer: A, tortoise

    The tortoise is a reptile (class Reptilia).

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