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WAEC WASSCE 2023

WAEC Biology 2023 past questions

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

All WAEC Biology past questions

  1. Question 1

    Nutrition

    Bile is produced by the

    1. Option A: gall bladder
    2. Option B: liver
    3. Option C: pancreas
    4. Option D: stomach
    Show the answer to question 1

    Answer: B, liver

    The liver makes bile; the gall bladder stores it.

  2. Question 2

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

    Answer: A, All normal wings

    NN × nn gives only Nn offspring, all showing normal wings.

  3. Question 3

    Excretion and respiration

    Anaerobic respiration in yeast produces

    1. Option A: lactic acid only
    2. Option B: oxygen and water
    3. Option C: glucose and oxygen
    4. Option D: ethanol and carbon(IV) oxide
    Show the answer to question 3

    Answer: D, ethanol and carbon(IV) oxide

    Yeast ferments sugar to ethanol and carbon(IV) oxide.

  4. Question 4

    Reproduction

    Yeast reproduces asexually by

    1. Option A: binary fission
    2. Option B: budding
    3. Option C: spore formation
    4. Option D: fragmentation
    Show the answer to question 4

    Answer: B, budding

    Yeast cells form buds.

  5. Question 5

    Classification

    Which of these animals belongs to the class Reptilia?

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

    Answer: D, chameleon

    The chameleon is a reptile (class Reptilia).

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