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WAEC WASSCE Biology 2013 past questions and answers

This 2013 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 2013 set with instant marking.

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Sample WAEC WASSCE Biology 2013 questions

1. A mangrove tree grows in waterlogged, oxygen-poor mud. Which feature most directly helps its roots obtain oxygen?
  1. Broad floating leaves
  2. Pneumatophores that project above the mud
  3. A thick waxy cuticle
  4. A deep taproot that reaches groundwater

Answer: B. Pneumatophores that project above the mud

Pneumatophores extend above the mud and allow gaseous exchange where submerged soil contains little oxygen.

2. In a grassland food chain, grass is eaten by grasshoppers, which are eaten by lizards. Which organisms occupy the second trophic level?
  1. Lizards
  2. Grass
  3. Grasshoppers
  4. Fungi

Answer: C. Grasshoppers

Grasshoppers are primary consumers and therefore occupy the second trophic level after producers.

3. A producer community stores 10,000 kJ of energy, and about 10% passes to the next trophic level. How much energy is available to the primary consumers?
  1. 1,000 kJ
  2. 100 kJ
  3. 5,000 kJ
  4. 9,000 kJ

Answer: A. 1,000 kJ

Ten percent of 10,000 kJ is 1,000 kJ.

4. A student counts 12 grass plants in a 0.5 m2 quadrat and estimates the density is uniform over a 10 m2 field. What is the estimated number of grass plants in the field?
  1. 60
  2. 120
  3. 200
  4. 240

Answer: D. 240

The density is 12/0.5 = 24 plants per m2, so 24 x 10 = 240 plants.

5. Which organisms are most likely to colonise bare rock first during primary succession?
  1. Mature trees
  2. Large grazing mammals
  3. Lichens
  4. Flowering shrubs

Answer: C. Lichens

Lichens can grow on bare rock and help form the first thin layer of soil.

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