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JAMB UTME Biology 2014 past questions and answers

This 2014 JAMB UTME 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 2014 set with instant marking.

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Sample JAMB UTME Biology 2014 questions

1. In a population of insects, a few individuals are naturally resistant to a pesticide before it is used. After repeated spraying, resistant insects become common mainly because they
  1. survive and leave more offspring than susceptible insects
  2. develop resistance because they need it
  3. pass on resistance acquired during their own lifetime
  4. change their genes in response to each spray

Answer: A. survive and leave more offspring than susceptible insects

Pre-existing resistant individuals are more likely to survive spraying and reproduce, increasing resistance in later generations.

2. The forelimbs of a bat, whale and human have similar underlying bone arrangements but perform different functions; this similarity is evidence of
  1. identical habitats
  2. descent from a common ancestor
  3. use of the limbs in the same way
  4. independent origin of the same bone pattern

Answer: B. descent from a common ancestor

Homologous structures share a basic anatomical plan inherited from a common ancestor, even when their functions differ.

3. The wings of a butterfly and a bird both enable flight, but their structures and evolutionary origins differ; they are best described as
  1. vestigial organs
  2. homologous structures
  3. analogous structures
  4. reproductive isolating mechanisms

Answer: C. analogous structures

Analogous structures perform similar functions but evolved independently and do not share the same structural origin.

4. A farm insect population contains both pesticide-susceptible and pesticide-resistant individuals. Which event most directly increases the frequency of resistance alleles after spraying?
  1. Susceptible insects deliberately avoid mating
  2. The pesticide converts every susceptible insect into a resistant one
  3. All insects produce equal numbers of offspring regardless of survival
  4. Resistant survivors reproduce and pass resistance alleles to offspring

Answer: D. Resistant survivors reproduce and pass resistance alleles to offspring

Differential survival and reproduction of resistant insects raises the proportion of resistance alleles in the population.

5. A stick insect closely resembles a twig among branches. The immediate survival advantage of this feature is that it
  1. makes the insect less easily detected by predators
  2. allows it to produce food by photosynthesis
  3. prevents all competition for mates
  4. increases the oxygen content of its blood

Answer: A. makes the insect less easily detected by predators

Resemblance to a twig provides camouflage that can reduce detection by predators.

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