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WAEC WASSCE Biology 2018 past questions and answers

This 2018 WAEC WASSCE 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 WAEC WASSCE Biology 2018 questions

1. Which structure is present in a typical plant cell but absent from an animal cell?
  1. A cellulose cell wall
  2. A cell membrane
  3. A nucleus
  4. Cytoplasm

Answer: A. A cellulose cell wall

A cellulose cell wall surrounds plant cells, whereas animal cells lack a cell wall.

2. An object 0.02 mm long appears 8 mm long under a microscope; what is the magnification?
  1. 40 times
  2. 400 times
  3. 4,000 times
  4. 0.0025 times

Answer: B. 400 times

Magnification is image size divided by actual size, so 8 mm / 0.02 mm = 400.

3. The specificity of an enzyme for its substrate is mainly due to the fact that the enzyme
  1. is used up during every reaction
  2. works only at very high temperatures
  3. has an active site with a complementary shape
  4. is made of simple sugars

Answer: C. has an active site with a complementary shape

A substrate binds to an enzyme's active site because their shapes and chemical properties are complementary.

4. In diffusion, particles move with a net movement from a region of
  1. low concentration to high concentration
  2. low pressure to high pressure only
  3. equal concentration to greater concentration
  4. higher concentration to lower concentration

Answer: D. higher concentration to lower concentration

Diffusion produces a net movement of particles down their concentration gradient.

5. A freshly cut celery stalk becomes firm after being placed in water because its cells
  1. gain water by osmosis and become turgid
  2. lose mineral salts by diffusion
  3. lose water and become plasmolysed
  4. produce extra cellulose immediately

Answer: A. gain water by osmosis and become turgid

Water enters the celery cells by osmosis, increasing their turgor pressure.

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