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NECO SSCE Biology 2011 past questions and answers

This 2011 NECO SSCE 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 2011 set with instant marking.

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Sample NECO SSCE Biology 2011 questions

1. In a grassland food chain, grass stores 20,000 kJ of energy and transfers about 10% to each next trophic level; how much energy is available to a secondary consumer?
  1. 200 kJ
  2. 2,000 kJ
  3. 20 kJ
  4. 18,000 kJ

Answer: A. 200 kJ

The secondary consumer is two transfers beyond grass, so 20,000 × 0.1 × 0.1 = 200 kJ.

2. A student captures and marks 40 grasshoppers, releases them, and later catches 50 grasshoppers, of which 10 are marked; using the Lincoln index, what is the estimated population?
  1. 100
  2. 200
  3. 250
  4. 500

Answer: B. 200

The estimate is (40 × 50) / 10 = 200 grasshoppers.

3. Which process returns nitrogen from dead organic matter to the soil as ammonium compounds?
  1. Nitrification
  2. Denitrification
  3. Ammonification
  4. Nitrogen fixation

Answer: C. Ammonification

Decomposer activity converts organic nitrogen in dead matter into ammonium during ammonification.

4. Which organisms are most likely to colonize bare rock first during primary succession?
  1. Mature forest trees
  2. Large herbivores
  3. Flowering shrubs
  4. Lichens

Answer: D. Lichens

Lichens can grow on bare rock and help weather it to form the first soil.

5. A large algal bloom is followed by fish deaths in a lake; which change most directly causes the fish deaths?
  1. Decomposers use up dissolved oxygen as algae decay
  2. The water gains too much dissolved oxygen
  3. The lake becomes less productive
  4. Fish produce excess chlorophyll

Answer: A. Decomposers use up dissolved oxygen as algae decay

Bacteria decomposing the dead algae consume dissolved oxygen, causing oxygen levels to fall below what fish need.

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