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JAMB UTME 2019

JAMB Biology 2019 past questions

7 objective questions from the 2019 JAMB Biology paper. Answer each one, then reveal the answer and explanation.

All JAMB Biology past questions

  1. Question 1

    Genetics

    A cross between two heterozygous tall plants (Tt × Tt) gives a phenotypic ratio of

    1. Option A: 1:1
    2. Option B: 1:2:1
    3. Option C: 3:1
    4. Option D: 9:3:3:1
    Show the answer to question 1

    Answer: C, 3:1

    The offspring are TT, Tt, Tt, and tt: three tall to one short.

  2. Question 2

    Transport

    Which plant tissue transports water?

    1. Option A: Phloem
    2. Option B: Xylem
    3. Option C: Cambium
    4. Option D: Cortex
    Show the answer to question 2

    Answer: B, Xylem

    Xylem carries water and mineral salts.

  3. Question 3

    Classification

    Identify the amphibian among the following animals.

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

    Answer: A, newt

    The newt is an amphibian (class Amphibia).

  4. Question 4

    Cell biology

    Which type of cell division produces gametes?

    1. Option A: Mitosis
    2. Option B: Meiosis
    3. Option C: Budding
    4. Option D: Binary fission
    Show the answer to question 4

    Answer: B, Meiosis

    Meiosis halves the chromosome number to form gametes.

  5. Question 5

    Ecology

    Which instrument measures wind speed?

    1. Option A: Anemometer
    2. Option B: Wind vane
    3. Option C: Hygrometer
    4. Option D: Thermometer
    Show the answer to question 5

    Answer: A, Anemometer

    An anemometer measures wind speed.

  6. Question 6

    Genetics

    In garden peas, the allele for yellow seeds (Y) is dominant over the allele for green seeds (y). What is the expected phenotypic ratio of the offspring of a cross between Yy and yy parents?

    1. Option A: 1 yellow seeds : 1 green seeds
    2. Option B: 3 yellow seeds : 1 green seeds
    3. Option C: All yellow seeds
    4. Option D: All green seeds
    Show the answer to question 6

    Answer: A, 1 yellow seeds : 1 green seeds

    Yy × yy gives equal numbers of Yy and yy: 1 : 1.

  7. Question 7

    Genetics

    In guinea pigs, the allele for black fur (B) is dominant over the allele for white fur (b). What is the expected phenotypic ratio of the offspring of a cross between Bb and Bb parents?

    1. Option A: 1 black fur : 1 white fur
    2. Option B: All black fur
    3. Option C: All white fur
    4. Option D: 3 black fur : 1 white fur
    Show the answer to question 7

    Answer: D, 3 black fur : 1 white fur

    Bb × Bb gives three offspring with at least one B to every bb: 3 : 1.

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