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WAEC WASSCE Biology 2025 past questions and answers

This 2025 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 2025 set with instant marking.

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Sample WAEC WASSCE Biology 2025 questions

1. A producer community stores 20,000 kJ of energy, and about 10% is transferred to the primary consumers. How much energy is transferred?
  1. 2,000 kJ
  2. 200 kJ
  3. 20,000 kJ
  4. 18,000 kJ

Answer: A. 2,000 kJ

Ten percent of 20,000 kJ is 0.10 x 20,000 = 2,000 kJ.

2. Which description best defines the ecological niche of an organism?
  1. The geographical region where its species originated
  2. Its role and mode of life within its ecosystem
  3. The exact place where it sleeps
  4. The physical features of its habitat only

Answer: B. Its role and mode of life within its ecosystem

A niche describes how an organism lives and functions, including its resource use and interactions.

3. Which organisms convert atmospheric nitrogen into compounds that plants can use?
  1. Nitrifying bacteria only
  2. Denitrifying bacteria
  3. Nitrogen-fixing bacteria
  4. Saprophytic fungi

Answer: C. Nitrogen-fixing bacteria

Nitrogen-fixing bacteria convert atmospheric nitrogen into nitrogen compounds usable in biological systems.

4. A student counts 40 grass plants in twenty 1 m x 1 m quadrats in a field of 100 m2. If the sampled quadrats are representative, what is the estimated number of grass plants in the field?
  1. 40
  2. 100
  3. 160
  4. 200

Answer: D. 200

The mean density is 40/20 = 2 plants per m2, so the estimate for 100 m2 is 200 plants.

5. A farmer releases a native insect that feeds specifically on a crop pest. This method of pest control is called
  1. biological control
  2. crop rotation
  3. fumigation
  4. mechanical control

Answer: A. biological control

Biological control uses a living natural enemy to reduce a pest population.

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