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JAMB UTME Biology 2022 past questions and answers

This 2022 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 2022 set with instant marking.

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Sample JAMB UTME Biology 2022 questions

1. In a grassland food chain, producers store 20,000 kJ of energy. If about 10% of energy passes to each successive trophic level, how much energy is available to the primary consumers?
  1. 2,000 kJ
  2. 200 kJ
  3. 10,000 kJ
  4. 18,000 kJ

Answer: A. 2,000 kJ

Primary consumers receive about 10% of the producers' energy, which is 2,000 kJ.

2. Which process converts nitrite ions in soil into nitrate ions that can be absorbed by plant roots?
  1. Nitrogen fixation
  2. Nitrification
  3. Denitrification
  4. Ammonification

Answer: B. Nitrification

Nitrifying bacteria oxidize nitrite ions to nitrate ions in the soil.

3. A population of antelope remains nearly constant in size over several years even though births and deaths continue. The most likely explanation is that the population has reached its
  1. biotic potential
  2. exponential phase
  3. carrying capacity
  4. colonizing stage

Answer: C. carrying capacity

At carrying capacity, available resources limit population growth and births approximately balance deaths.

4. After a bare rock surface is exposed, which organisms are most likely to establish first and help form soil?
  1. Large trees
  2. Grasses
  3. Shrubs
  4. Lichens

Answer: D. Lichens

Lichens can colonize bare rock and gradually contribute organic matter and weathered material to soil formation.

5. The breathing roots that project above waterlogged mud in many mangrove plants are adaptations mainly for
  1. obtaining oxygen
  2. absorbing mineral salts from seawater
  3. reducing water loss through leaves
  4. anchoring the plant in dry soil

Answer: A. obtaining oxygen

Pneumatophores expose root tissue to air where oxygen is scarce in waterlogged soil.

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