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JAMB UTME Biology 2021 past questions and answers

This 2021 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 2021 set with instant marking.

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Sample JAMB UTME Biology 2021 questions

1. A variegated leaf is exposed to sunlight after its starch has been removed. After testing with iodine, which region is expected to turn blue-black?
  1. A green region kept in light
  2. A green region kept in darkness
  3. A white region kept in light
  4. A white region kept in darkness

Answer: A. A green region kept in light

Only the illuminated green region has both chlorophyll and light for photosynthesis, so it forms starch.

2. Bile aids the digestion of fats mainly by
  1. breaking large fat globules into smaller droplets
  2. converting fatty acids into glycerol
  3. providing lipase for the hydrolysis of fats
  4. absorbing digested fats into the blood

Answer: A. breaking large fat globules into smaller droplets

Bile salts emulsify fat into small droplets, increasing the surface area available to lipase.

3. A plant is supplied with water and carbon dioxide, but its leaves are kept in darkness for several days. Which process will be most directly limited?
  1. Absorption of mineral ions by roots
  2. Translocation of sucrose from leaves
  3. Respiration in living cells
  4. Synthesis of carbohydrate in the leaves

Answer: D. Synthesis of carbohydrate in the leaves

Light energy is required for photosynthesis, so carbohydrate synthesis is limited in darkness.

4. Which enzyme is chiefly responsible for converting proteins into peptides in the stomach?
  1. Amylase
  2. Pepsin
  3. Maltase
  4. Lipase

Answer: B. Pepsin

Pepsin is a stomach protease that begins protein digestion by producing shorter peptides.

5. A ring of bark is removed from a woody stem without cutting the inner wood. After some time, swelling above the ring is most likely due to the accumulation of
  1. water moving upward through xylem
  2. mineral salts transported in xylem
  3. oxygen diffusing into the stem
  4. sugars transported in phloem

Answer: D. sugars transported in phloem

Removing the bark interrupts phloem transport, causing sugars to accumulate above the cut.

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