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WAEC WASSCE 2019

WAEC Biology 2019 past questions

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

All WAEC Biology past questions

  1. Question 1

    The cell

    Which organelle is the site of aerobic respiration?

    1. Option A: Nucleus
    2. Option B: Mitochondrion
    3. Option C: Ribosome
    4. Option D: Golgi body
    Show the answer to question 1

    Answer: B, Mitochondrion

    Aerobic respiration releases energy in the mitochondria.

  2. Question 2

    Classification

    From the list below, select the animal that is an amphibian.

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

    Answer: B, toad

    The toad is an amphibian (class Amphibia).

  3. Question 3

    Transport

    Which plant tissue transports manufactured food?

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

    Answer: A, Phloem

    Phloem carries sugars.

  4. Question 4

    Genetics

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

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

    Answer: C, 1 YY : 2 Yy : 1 yy

    Yy × Yy gives YY, Yy, Yy, and yy: a 1 : 2 : 1 genotypic ratio.

  5. Question 5

    Ecology

    Which gas contributes most to the greenhouse effect from human activity?

    1. Option A: Oxygen
    2. Option B: Nitrogen
    3. Option C: Hydrogen
    4. Option D: Carbon(IV) oxide
    Show the answer to question 5

    Answer: D, Carbon(IV) oxide

    Burning fuels raises carbon(IV) oxide levels.

  6. Question 6

    Cell biology

    How many chromosomes are in a normal human body cell?

    1. Option A: 23
    2. Option B: 46
    3. Option C: 44
    4. Option D: 48
    Show the answer to question 6

    Answer: B, 46

    Human body cells have 23 pairs, 46 chromosomes.

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

    Answer: A, All black fur

    BB × bb gives only Bb offspring, all showing black fur.

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