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WAEC WASSCE Biology 2020 past questions and answers

This 2020 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 2020 set with instant marking.

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Sample WAEC WASSCE Biology 2020 questions

1. Which tissue carries water and dissolved mineral salts from the roots to the leaves of a flowering plant?
  1. Xylem
  2. Phloem
  3. Cambium
  4. Epidermis

Answer: A. Xylem

Xylem vessels conduct water and mineral salts mainly upwards from the roots.

2. The continuous upward movement of water in a xylem vessel is helped most directly by the cohesion of water molecules, which means that they
  1. evaporate rapidly from the roots
  2. attract one another and form a continuous column
  3. are converted into mineral salts
  4. move through phloem sieve tubes

Answer: B. attract one another and form a continuous column

Cohesion holds water molecules together so the transpiration pull can draw up a continuous column.

3. In a mammal, exchange of dissolved substances between blood and body cells occurs mainly through the walls of the
  1. arteries
  2. veins
  3. capillaries
  4. aorta

Answer: C. capillaries

The thin, permeable walls of capillaries allow materials to diffuse between blood and tissues.

4. On which day would transpiration from a well-watered plant most likely be greatest?
  1. A cool, humid and still day
  2. A cool, windy and humid day
  3. A cool, dry and still day
  4. A hot, dry and windy day

Answer: D. A hot, dry and windy day

Heat, dry air and wind increase evaporation and maintain a steep water-vapour gradient around leaves.

5. When yeast respires anaerobically in a sugar solution, the main products are
  1. ethanol and carbon dioxide
  2. lactic acid and oxygen
  3. water and oxygen
  4. starch and carbon dioxide

Answer: A. ethanol and carbon dioxide

Anaerobic respiration in yeast converts glucose into ethanol, carbon dioxide and a small amount of energy.

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