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WAEC WASSCE Biology 2026 past questions and answers

This 2026 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 2026 set with instant marking.

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Sample WAEC WASSCE Biology 2026 questions

1. On newly exposed bare rock, which organisms are most likely to establish first during primary succession?
  1. Tall grasses
  2. Lichens
  3. Shrubs
  4. Forest trees

Answer: B. Lichens

Lichens can colonize bare rock and gradually help form soil for later communities.

2. Which structure enables many mangrove trees to obtain oxygen from waterlogged soil?
  1. Storage roots
  2. Clinging tendrils
  3. Leaf spines
  4. Pneumatophores

Answer: D. Pneumatophores

Pneumatophores project above the waterlogged ground and allow gaseous exchange.

3. A persistent pesticide becomes more concentrated in organisms at successively higher trophic levels; this process is called
  1. biomagnification
  2. nitrification
  3. eutrophication
  4. succession

Answer: A. biomagnification

Biomagnification is the increasing concentration of a persistent pollutant up a food chain.

4. Which environmental problem is most directly increased by the release of chlorofluorocarbons into the atmosphere?
  1. Acidification of lakes
  2. Eutrophication of rivers
  3. Depletion of the ozone layer
  4. Desertification

Answer: C. Depletion of the ozone layer

Chlorofluorocarbons release chlorine compounds that destroy stratospheric ozone.

5. A grazing food chain normally begins with
  1. carnivores
  2. decomposers
  3. green plants
  4. herbivores

Answer: C. green plants

Green plants are producers that capture light energy and provide food for herbivores.

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