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WAEC WASSCE Biology 2015 past questions and answers

This 2015 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 2015 set with instant marking.

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Sample WAEC WASSCE Biology 2015 questions

1. In a grassland food chain, grass stores 20 000 kJ of energy and transfers about 10% to the next trophic level; approximately how much energy reaches the primary consumers?
  1. 200 kJ
  2. 20 000 kJ
  3. 2 000 kJ
  4. 18 000 kJ

Answer: C. 2 000 kJ

Ten percent of 20 000 kJ is 2 000 kJ.

2. A student marks 30 grasshoppers, releases them, and later captures 50 grasshoppers, of which 10 are marked; using the capture-recapture estimate, what is the approximate population?
  1. 150
  2. 90
  3. 80
  4. 600

Answer: A. 150

The estimate is (30 × 50) ÷ 10 = 150 grasshoppers.

3. Which process returns carbon dioxide to the atmosphere from dead plant material?
  1. Photosynthesis by algae
  2. Nitrogen fixation
  3. Transpiration
  4. Respiration by decomposers

Answer: D. Respiration by decomposers

Decomposers respire while breaking down dead material and release carbon dioxide.

4. A river receives warm water discharged from a power station; which immediate effect is most likely on fish in the receiving stretch?
  1. Dissolved oxygen increases
  2. Dissolved oxygen decreases
  3. Water becomes more saline
  4. Photosynthesis stops completely

Answer: B. Dissolved oxygen decreases

Warmer water holds less dissolved oxygen, increasing stress on fish.

5. Which action best describes in-situ conservation of an endangered antelope?
  1. Storing its cells in a laboratory
  2. Breeding it only in a zoo
  3. Protecting its natural habitat in a reserve
  4. Keeping its sperm in a gene bank

Answer: C. Protecting its natural habitat in a reserve

In-situ conservation protects a species within its natural environment.

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