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WAEC WASSCE Biology 2009 past questions and answers

This 2009 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 2009 set with instant marking.

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Sample WAEC WASSCE Biology 2009 questions

1. In a grassland food chain, why is less energy available to a hawk than to the grass at the start of the chain?
  1. Energy is lost as heat and through life processes at each trophic level.
  2. Producers do not store energy in their tissues.
  3. Consumers convert all food energy into new biomass.
  4. Energy is recycled repeatedly between trophic levels.

Answer: A. Energy is lost as heat and through life processes at each trophic level.

Respiration, heat loss and waste mean that only part of the energy at one trophic level passes to the next.

2. In a food web, a sudden reduction in the number of grasshoppers is most likely to cause an immediate decrease in which population?
  1. Grass plants that the grasshoppers eat
  2. Frogs that feed on the grasshoppers
  3. Decomposers that act on all dead matter
  4. Sunlight reaching the habitat

Answer: B. Frogs that feed on the grasshoppers

Frogs that depend on grasshoppers as food may decline when that prey becomes scarce.

3. Which process returns nitrogen from dead organisms and animal wastes to the soil as ammonium compounds?
  1. Denitrification
  2. Nitrogen fixation
  3. Ammonification
  4. Nitrification

Answer: C. Ammonification

Decomposer microorganisms convert organic nitrogen in dead matter and waste into ammonium compounds during ammonification.

4. A population has 240 individuals at the start of a year, and 36 die during that year; if births and migration are ignored, what is the death rate per 1,000 individuals per year?
  1. 15
  2. 36
  3. 120
  4. 150

Answer: D. 150

The rate is (36/240) x 1,000 = 150 deaths per 1,000 individuals per year.

5. Which action is most directly aimed at conserving an endangered animal in its natural habitat?
  1. Establishing and enforcing a protected reserve in its habitat
  2. Removing all predators from every ecosystem
  3. Replacing its habitat with farmland
  4. Capturing every individual for display

Answer: A. Establishing and enforcing a protected reserve in its habitat

A protected reserve conserves the species in its natural ecosystem while limiting harmful human activities.

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