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JAMB UTME Biology 2018 past questions and answers

This 2018 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 2018 set with instant marking.

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Sample JAMB UTME Biology 2018 questions

1. Mangrove trees growing in waterlogged mud often develop pneumatophores. Their main function is to
  1. absorb mineral salts from seawater
  2. obtain oxygen for respiration
  3. store excess food as starch
  4. anchor the leaves above the tide

Answer: B. obtain oxygen for respiration

Pneumatophores project above oxygen-poor mud and provide openings for gaseous exchange.

2. A cell engulfs a bacterium and breaks it down using enzymes enclosed in a membrane-bound sac. Which organelle contains these enzymes?
  1. Ribosome
  2. Golgi body
  3. Lysosome
  4. Centriole

Answer: C. Lysosome

Lysosomes contain hydrolytic enzymes that digest engulfed material and worn-out cell components.

3. Which feature of a mature xylem vessel most directly enables it to conduct water with little resistance?
  1. Its cells form a continuous hollow tube with no end walls
  2. Its cells contain numerous chloroplasts
  3. Its walls are thin and freely permeable to sugars
  4. Its cells have large nuclei that pump water upward

Answer: A. Its cells form a continuous hollow tube with no end walls

The absence of end walls in joined vessel elements creates a continuous lumen for water flow.

4. The small intestine is adapted for absorption partly by the presence of villi. Which property of villi most directly increases the rate of absorption?
  1. They secrete hydrochloric acid into the intestine
  2. They contain thick layers of muscle
  3. They prevent digested food from entering capillaries
  4. They provide a large surface area and a short diffusion distance

Answer: D. They provide a large surface area and a short diffusion distance

Numerous thin-walled villi provide a large absorptive surface close to blood capillaries and lacteals.

5. A destarched plant is placed in sunlight with part of a leaf covered by opaque paper. After testing the leaf for starch, which result is expected?
  1. Both covered and uncovered regions turn blue-black
  2. Only the uncovered region turns blue-black
  3. Only the covered region turns blue-black
  4. Neither region turns blue-black

Answer: B. Only the uncovered region turns blue-black

The uncovered region receives light for photosynthesis and forms starch, whereas the covered region does not.

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