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JAMB UTME Biology 2020 past questions and answers

This 2020 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 2020 set with instant marking.

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Sample JAMB UTME Biology 2020 questions

1. Which structure in an ileum villus carries most absorbed products of fat digestion away from the intestine?
  1. The lacteal
  2. The hepatic portal vein
  3. The blood capillary network
  4. The intestinal lumen

Answer: A. The lacteal

Fatty acids and glycerol are absorbed into epithelial cells, re-formed into lipids and transported mainly through the lacteals as chylomicrons.

2. The walls of arteries contain abundant elastic tissue mainly because arteries must
  1. allow exchange of materials with body cells
  2. withstand the high pressure of blood pumped from the heart
  3. prevent blood from clotting
  4. carry blood at a lower pressure than veins

Answer: B. withstand the high pressure of blood pumped from the heart

Arteries receive blood directly from the heart, so their elastic, muscular walls withstand and smooth out high-pressure pulses.

3. Which blood vessel carries absorbed glucose and amino acids from the small intestine to the liver?
  1. The pulmonary artery
  2. The renal vein
  3. The hepatic portal vein
  4. The hepatic vein

Answer: C. The hepatic portal vein

The hepatic portal vein transports nutrient-rich blood from the digestive tract to the liver for processing.

4. In bright light, stomata of a well-watered leaf tend to open because the guard cells
  1. lose water and become flaccid
  2. lose potassium ions and shrink
  3. are pulled apart by the mesophyll cells
  4. take up solutes, gain water and become turgid

Answer: D. take up solutes, gain water and become turgid

Solute accumulation lowers the water potential of guard cells, causing water uptake and turgidity that opens the stomatal pore.

5. A destarched plant is exposed to sunlight with carbon dioxide available, but one half of a leaf is covered with opaque paper. After testing the leaf with iodine, which result is expected?
  1. Only the uncovered half turns blue-black
  2. Both halves turn blue-black because water is present
  3. Only the covered half turns blue-black
  4. Neither half turns blue-black because oxygen is absent

Answer: A. Only the uncovered half turns blue-black

The uncovered region receives light and can photosynthesise starch, whereas the covered region cannot.

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