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WAEC WASSCE Biology 2006 past questions and answers

This 2006 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 2006 set with instant marking.

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Sample WAEC WASSCE Biology 2006 questions

1. Which tissue carries water and dissolved mineral salts from a plant's roots toward its leaves?
  1. Xylem
  2. Phloem
  3. Cortex
  4. Epidermis

Answer: A. Xylem

Xylem vessels conduct water and mineral salts upward from the roots.

2. Which change would most directly reduce water loss from a leaf on a hot, dry afternoon?
  1. Opening the stomata wider
  2. Closing the stomata
  3. Increasing leaf surface area
  4. Removing the waxy cuticle

Answer: B. Closing the stomata

Closing stomata reduces the diffusion of water vapour from the leaf.

3. In many fish, water flows over the gills in the opposite direction to blood flow; what is the main advantage of this arrangement?
  1. It prevents water from entering the mouth
  2. It allows fish to breathe without blood
  3. It maintains an oxygen concentration gradient along the gill surface
  4. It raises the temperature of the blood

Answer: C. It maintains an oxygen concentration gradient along the gill surface

Countercurrent flow maintains an oxygen diffusion gradient across the gills.

4. What is the main role of oxygen in aerobic respiration?
  1. It converts proteins directly into glucose
  2. It stores energy in the cell wall
  3. It removes water from the cytoplasm
  4. It accepts electrons at the end of the respiratory chain

Answer: D. It accepts electrons at the end of the respiratory chain

Oxygen is the final electron acceptor in the aerobic respiratory chain.

5. In which organ is most of the urea in humans produced?
  1. Liver
  2. Kidney
  3. Lung
  4. Pancreas

Answer: A. Liver

The liver converts excess amino-acid nitrogen into urea.

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