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WAEC WASSCE 2018

WAEC Biology 2018 past questions

6 objective questions from the 2018 WAEC Biology paper. Answer each one, then reveal the answer and explanation.

All WAEC Biology past questions

  1. Question 1

    Genetics

    In garden peas, the allele for round seeds (R) is dominant over the allele for wrinkled seeds (r). What is the expected phenotypic ratio of the offspring of a cross between RR and rr parents?

    1. Option A: 3 round seeds : 1 wrinkled seeds
    2. Option B: All round seeds
    3. Option C: 1 round seeds : 1 wrinkled seeds
    4. Option D: All wrinkled seeds
    Show the answer to question 1

    Answer: B, All round seeds

    RR × rr gives only Rr offspring, all showing round seeds.

  2. Question 2

    Transport

    How many chambers does the mammalian heart have?

    1. Option A: Four
    2. Option B: Two
    3. Option C: Three
    4. Option D: Five
    Show the answer to question 2

    Answer: A, Four

    Two atria and two ventricles.

  3. Question 3

    Cell biology

    Which organism has cells without a true nucleus?

    1. Option A: Amoeba
    2. Option B: Yeast
    3. Option C: Spirogyra
    4. Option D: Bacterium
    Show the answer to question 3

    Answer: D, Bacterium

    Bacteria are prokaryotes.

  4. Question 4

    Ecology

    Which instrument measures relative humidity?

    1. Option A: Hygrometer
    2. Option B: Anemometer
    3. Option C: Barometer
    4. Option D: Rain gauge
    Show the answer to question 4

    Answer: A, Hygrometer

    A hygrometer measures humidity.

  5. Question 5

    Genetics

    In cattle, the allele for hornlessness (H) is dominant over the allele for horns (h). What is the genotypic ratio of the offspring of a cross between two Hh parents?

    1. Option A: 1 HH : 2 Hh : 1 hh
    2. Option B: 3 HH : 1 hh
    3. Option C: 1 HH : 1 hh
    4. Option D: 2 HH : 1 Hh : 1 hh
    Show the answer to question 5

    Answer: A, 1 HH : 2 Hh : 1 hh

    Hh × Hh gives HH, Hh, Hh, and hh: a 1 : 2 : 1 genotypic ratio.

  6. Question 6

    Classification

    From the list below, select the animal that is a reptile.

    1. Option A: eagle
    2. Option B: chameleon
    3. Option C: newt
    4. Option D: mudskipper
    Show the answer to question 6

    Answer: B, chameleon

    The chameleon is a reptile (class Reptilia).

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