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NECO SSCE Biology 2015 past questions and answers

This 2015 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 2015 set with instant marking.

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Sample NECO SSCE Biology 2015 questions

1. Why does the amount of usable energy generally decrease at each successive trophic level in a food chain?
  1. Producers consume all the energy before herbivores feed
  2. Energy is recycled completely through the food chain
  3. Organisms lose much energy as heat and through metabolic activities
  4. Decomposers prevent energy from entering consumers

Answer: C. Organisms lose much energy as heat and through metabolic activities

Only a fraction of the energy at one trophic level is transferred to the next, while much is lost as heat and in waste.

2. A lake receives large quantities of fertilizer runoff and later has many dead fish; which change most directly contributes to the fish deaths?
  1. Decomposition of excess algae reduces dissolved oxygen
  2. The fertilizer permanently removes nitrogen from the water
  3. Runoff prevents all sunlight from reaching the lake bottom immediately
  4. The fish begin producing oxygen faster than they can use it

Answer: A. Decomposition of excess algae reduces dissolved oxygen

Nutrient enrichment can cause algal blooms whose decomposition uses up dissolved oxygen needed by fish.

3. Researchers mark 100 grasshoppers and release them; later they catch 200 grasshoppers, of which 20 are marked, and estimate the population using the mark-recapture method; what is the estimate?
  1. 400
  2. 800
  3. 900
  4. 1,000

Answer: D. 1,000

The estimate is (100 marked x 200 in the second sample) / 20 recaptured marked = 1,000 grasshoppers.

4. A flowering plant provides nectar to an insect, and the insect transfers pollen between flowers; what type of relationship is this?
  1. Parasitism
  2. Mutualism
  3. Competition
  4. Commensalism

Answer: B. Mutualism

Both organisms benefit because the insect obtains food and the plant receives pollination.

5. Which organisms are most likely to colonize bare rock during the early stages of primary succession?
  1. Large trees
  2. Earthworms
  3. Lichens
  4. Large grazing mammals

Answer: C. Lichens

Lichens can grow on bare rock and help weather it, contributing to the formation of soil.

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