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WAEC WASSCE 2021

WAEC Biology 2021 past questions

6 objective questions from the 2021 WAEC Biology paper. Answer each one, then reveal the answer and explanation.

All WAEC Biology past questions

  1. Question 1

    Ecology

    Organisms that make their own food are called

    1. Option A: consumers
    2. Option B: decomposers
    3. Option C: producers
    4. Option D: parasites
    Show the answer to question 1

    Answer: C, producers

    Producers, such as green plants, make food by photosynthesis.

  2. Question 2

    Nutrition

    The Biuret test is used to detect

    1. Option A: starch
    2. Option B: fat
    3. Option C: protein
    4. Option D: glucose
    Show the answer to question 2

    Answer: C, protein

    Biuret reagent turns purple with protein.

  3. Question 3

    Transport

    The pulmonary vein carries

    1. Option A: deoxygenated blood to the heart
    2. Option B: oxygenated blood to the lungs
    3. Option C: oxygenated blood to the heart
    4. Option D: deoxygenated blood to the lungs
    Show the answer to question 3

    Answer: C, oxygenated blood to the heart

    It returns oxygenated blood from the lungs.

  4. Question 4

    Genetics

    In cattle, the allele for hornlessness (H) is dominant over the allele for horns (h). What is the expected phenotypic ratio of the offspring of a cross between HH and hh parents?

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

    Answer: B, All hornlessness

    HH × hh gives only Hh offspring, all showing hornlessness.

  5. Question 5

    Classification

    Which of these animals belongs to the class Mammalia?

    1. Option A: ostrich
    2. Option B: dolphin
    3. Option C: crocodile
    4. Option D: salamander
    Show the answer to question 5

    Answer: B, dolphin

    The dolphin is a mammal (class Mammalia).

  6. Question 6

    Reproduction

    The fusion of a male and a female gamete is called

    1. Option A: pollination
    2. Option B: germination
    3. Option C: ovulation
    4. Option D: fertilisation
    Show the answer to question 6

    Answer: D, fertilisation

    Gametes fuse at fertilisation.

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