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JAMB UTME Biology 2011 past questions and answers

This 2011 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 2011 set with instant marking.

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Sample JAMB UTME Biology 2011 questions

1. In a large randomly mating population, 9% of individuals show a recessive phenotype. Assuming Hardy-Weinberg equilibrium, what proportion of the population is heterozygous?
  1. 0.09
  2. 0.30
  3. 0.42
  4. 0.49

Answer: C. 0.42

The recessive phenotype frequency is q^2 = 0.09, so q = 0.3, p = 0.7, and 2pq = 0.42.

2. If producers store 5,000 kJ of energy and about 10% passes to primary consumers, how much energy is available to the primary consumers?
  1. 500 kJ
  2. 50 kJ
  3. 4,500 kJ
  4. 5,500 kJ

Answer: A. 500 kJ

Ten percent of 5,000 kJ is 500 kJ.

3. A biologist marks 40 grasshoppers and releases them. Later, 50 grasshoppers are captured, of which 10 are marked; using the capture-recapture estimate, what is the population size?
  1. 100
  2. 160
  3. 180
  4. 200

Answer: D. 200

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

4. A population in a stable habitat stops increasing as it approaches the carrying capacity mainly because
  1. all individuals become genetically identical
  2. limiting resources reduce the population's net growth rate
  3. immigration permanently ceases
  4. predators stop reproducing

Answer: B. limiting resources reduce the population's net growth rate

As resources become limiting near carrying capacity, competition and other density-dependent factors lower net population growth.

5. A persistent pesticide enters a lake food chain and becomes more concentrated at each trophic level. Which organism is most likely to contain the highest concentration?
  1. A fish-eating bird
  2. A water flea
  3. An aquatic plant
  4. A decomposer bacterium

Answer: A. A fish-eating bird

Biomagnification causes persistent pollutants to reach their highest concentration in top consumers such as fish-eating birds.

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