PassSpark

JAMB UTME Biology 2023 past questions and answers

This 2023 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 2023 set with instant marking.

Practise the full 2023 setTimed exam mode

Sample JAMB UTME Biology 2023 questions

1. If producers in a grassland store 10,000 kJ of energy, approximately how much energy is available to primary consumers when transfer efficiency is 10%?
  1. 100 kJ
  2. 1,000 kJ
  3. 5,000 kJ
  4. 10,000 kJ

Answer: B. 1,000 kJ

Ten percent of 10,000 kJ is 1,000 kJ.

2. A student counts 48 seedlings in a quadrat measuring 12 m^2; what is the estimated density of seedlings?
  1. 0.25 seedlings per m^2
  2. 2 seedlings per m^2
  3. 3 seedlings per m^2
  4. 4 seedlings per m^2

Answer: D. 4 seedlings per m^2

Density is the number of organisms divided by area, so 48/12 = 4 seedlings per m^2.

3. Which organisms are most likely to colonize bare rock at the beginning of primary succession?
  1. Lichens
  2. Mature forest trees
  3. Large herbivores
  4. Floating algae

Answer: A. Lichens

Lichens can colonize bare rock and gradually help form soil for later communities.

4. Which process returns nitrogen from soil nitrates to the atmosphere as nitrogen gas?
  1. Nitrification
  2. Nitrogen fixation
  3. Denitrification
  4. Ammonification

Answer: C. Denitrification

Denitrifying bacteria reduce soil nitrates to nitrogen gas, returning nitrogen to the atmosphere.

5. A persistent pesticide enters a food chain and becomes more concentrated at each trophic level; which organism is likely to have the highest concentration?
  1. Grass
  2. A top carnivore
  3. A primary consumer
  4. A decomposer feeding on grass

Answer: B. A top carnivore

Biomagnification causes persistent pollutants to reach their greatest concentration in organisms at the highest trophic level.

More JAMB UTME Biology years

20262025202420222021202020192018201720162015201420132012201120102009200820072006200520042003200220012000

All JAMB UTME Biology years · JAMB UTME subjects

PassSpark questions are original practice questions written to each exam's syllabus and format, in the style of past questions. They are not official past papers and are not affiliated with JAMB, WAEC, NECO, any university or any exam body.