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JAMB UTME Biology 2003 past questions and answers

This 2003 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 2003 set with instant marking.

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Sample JAMB UTME Biology 2003 questions

1. Which part of a mitochondrion provides an extensive surface for reactions involved in aerobic respiration?
  1. Cristae
  2. Ribosomes
  3. Nucleolus
  4. Cell wall

Answer: A. Cristae

The folds of the inner mitochondrial membrane form cristae that provide a large surface for respiratory reactions.

2. What happens to the protoplast of a plant cell placed in a strongly concentrated salt solution?
  1. It becomes fully turgid as water enters.
  2. It shrinks away from the cell wall as water leaves.
  3. It divides rapidly to dilute the salt.
  4. It bursts because the vacuole absorbs salt water.

Answer: B. It shrinks away from the cell wall as water leaves.

Water leaves the plant cell by osmosis into the more concentrated solution, causing plasmolysis.

3. Across a selectively permeable membrane, in which direction is there a net movement of water by osmosis?
  1. From a concentrated solution to a dilute solution, regardless of the membrane.
  2. From a region of low water potential to one of high water potential.
  3. From a dilute solution to a more concentrated solution.
  4. From a region with fewer water molecules to one with more water molecules.

Answer: C. From a dilute solution to a more concentrated solution.

Osmosis is the net movement of water through a selectively permeable membrane from a dilute solution to a more concentrated one.

4. In a typical bacterium, where is its main chromosome found?
  1. Inside a membrane-bound nucleus
  2. Within the mitochondrion
  3. Attached to the cell wall
  4. In a nucleoid region of the cytoplasm

Answer: D. In a nucleoid region of the cytoplasm

Bacteria lack a membrane-bound nucleus, so their chromosome lies in a nucleoid region of the cytoplasm.

5. Which feature of a mature xylem vessel helps it resist collapse while water is being pulled upward?
  1. Its thick lignified walls
  2. Its numerous chloroplasts
  3. Its thin, flexible cuticle
  4. Its large nucleus

Answer: A. Its thick lignified walls

Lignin strengthens xylem walls and helps prevent the vessels from collapsing under tension.

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