WAEC Biology past questions and answers

1. Question 1

   WAEC 2024Classification

   Which of these animals belongs to the class Amphibia?

   1. AOption A: toad
   2. BOption B: hen
   3. COption C: chameleon
   4. DOption D: tilapia
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   Answer: A, toad

   The toad is an amphibian (class Amphibia).

2. Question 2

   WAEC 2024Excretion and respiration

   The muscle that separates the thorax from the abdomen is the

   1. AOption A: diaphragm
   2. BOption B: intercostal muscle
   3. COption C: biceps
   4. DOption D: sphincter
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   Answer: A, diaphragm

   The diaphragm is a sheet of muscle below the lungs.

3. Question 3

   WAEC 2024Reproduction

   Which hormone maintains pregnancy?

   1. AOption A: Oestrogen
   2. BOption B: Progesterone
   3. COption C: Testosterone
   4. DOption D: Insulin
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   Answer: B, Progesterone

   Progesterone keeps the uterine lining in place.

4. Question 4

   WAEC 2024Genetics

   In pea plants, the allele for tall (T) is dominant over the allele for short (t). What is the genotypic ratio of the offspring of a cross between two Tt parents?

   1. AOption A: 3 TT : 1 tt
   2. BOption B: 1 TT : 1 tt
   3. COption C: 1 TT : 2 Tt : 1 tt
   4. DOption D: 2 TT : 1 Tt : 1 tt
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   Answer: C, 1 TT : 2 Tt : 1 tt

   Tt × Tt gives TT, Tt, Tt, and tt: a 1 : 2 : 1 genotypic ratio.

5. Question 5

   WAEC 2024Nutrition

   The raw materials for photosynthesis are

   1. AOption A: oxygen and glucose
   2. BOption B: starch and water
   3. COption C: nitrogen and oxygen
   4. DOption D: carbon(IV) oxide and water
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   Answer: D, carbon(IV) oxide and water

   Plants make glucose from carbon(IV) oxide and water.

6. Question 6

   WAEC 2023Nutrition

   Bile is produced by the

   1. AOption A: gall bladder
   2. BOption B: liver
   3. COption C: pancreas
   4. DOption D: stomach
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   Answer: B, liver

   The liver makes bile; the gall bladder stores it.

7. Question 7

   WAEC 2023Genetics

   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. AOption A: All normal wings
   2. BOption B: 3 normal wings : 1 vestigial wings
   3. COption C: 1 normal wings : 1 vestigial wings
   4. DOption D: All vestigial wings
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   Answer: A, All normal wings

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

8. Question 8

   WAEC 2023Excretion and respiration

   Anaerobic respiration in yeast produces

   1. AOption A: lactic acid only
   2. BOption B: oxygen and water
   3. COption C: glucose and oxygen
   4. DOption D: ethanol and carbon(IV) oxide
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   Answer: D, ethanol and carbon(IV) oxide

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

9. Question 9

   WAEC 2023Reproduction

   Yeast reproduces asexually by

   1. AOption A: binary fission
   2. BOption B: budding
   3. COption C: spore formation
   4. DOption D: fragmentation
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   Answer: B, budding

   Yeast cells form buds.

10. Question 10

    WAEC 2023Classification

    Which of these animals belongs to the class Reptilia?

    1. AOption A: dolphin
    2. BOption B: hen
    3. COption C: caecilian
    4. DOption D: chameleon
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    Answer: D, chameleon

    The chameleon is a reptile (class Reptilia).

More Biology: JAMB Biology past questions.