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WAEC WASSCE Biology 2024 past questions and answers

This 2024 WAEC WASSCE Biology set has 40 practice questions. Try these 5 free sample questions, tap a question to reveal the answer and explanation. Then practise the whole 2024 set with instant marking.

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Sample WAEC WASSCE Biology 2024 questions

1. If producers in a grassland store 12,000 kJ of energy and about 10% is transferred to primary consumers, how much energy is available to the primary consumers?
  1. 1,200 kJ
  2. 120 kJ
  3. 10,800 kJ
  4. 12,000 kJ

Answer: A. 1,200 kJ

Ten per cent of 12,000 kJ is 1,200 kJ.

2. A student counts 24 snails in a quadrat area of 6 m^2; what is the estimated snail density?
  1. 0.25 snails/m^2
  2. 4 snails/m^2
  3. 18 snails/m^2
  4. 30 snails/m^2

Answer: B. 4 snails/m^2

Density is the number counted divided by area, so 24/6 = 4 snails/m^2.

3. In the food chain grass -> grasshopper -> frog -> snake, which organism is the secondary consumer?
  1. Grass
  2. Grasshopper
  3. Frog
  4. Snake

Answer: C. Frog

The frog feeds on the primary consumer, the grasshopper, and is therefore a secondary consumer.

4. What is the main ecological role of decomposers such as bacteria and fungi?
  1. They convert mineral salts into sunlight
  2. They make food by consuming producers
  3. They remove oxygen from the atmosphere permanently
  4. They release mineral nutrients from dead organic matter

Answer: D. They release mineral nutrients from dead organic matter

Decomposers break down dead organic material and return mineral nutrients to the environment.

5. Which organisms are most likely to colonize bare rock first during primary succession?
  1. Lichens
  2. Large trees
  3. Earthworms
  4. Mammals

Answer: A. Lichens

Lichens can grow on bare rock and help form the first soil during primary succession.

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