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WAEC WASSCE Biology 2021 past questions and answers

This 2021 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 2021 set with instant marking.

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Sample WAEC WASSCE Biology 2021 questions

1. A sample of crushed yam is tested with iodine solution. Which colour change indicates the presence of starch?
  1. Yellow-brown to blue-black
  2. Blue to brick-red
  3. Colourless to purple
  4. Green to orange

Answer: A. Yellow-brown to blue-black

Iodine solution changes from yellow-brown to blue-black when starch is present.

2. What is the main role of bile in the digestion of food in humans?
  1. It converts proteins into amino acids.
  2. It emulsifies large fat globules into smaller droplets.
  3. It changes maltose into glucose.
  4. It hydrolyses starch into maltose.

Answer: B. It emulsifies large fat globules into smaller droplets.

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

3. Which substances are the raw materials used directly in photosynthesis to form glucose?
  1. Oxygen and glucose
  2. Nitrogen and water
  3. Carbon dioxide and water
  4. Carbon dioxide and oxygen

Answer: C. Carbon dioxide and water

Photosynthesis uses carbon dioxide and water, with light energy, to produce glucose and oxygen.

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

Answer: D. Xylem

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

5. A plant cell is placed in distilled water. Which movement of water is most likely to occur across its partially permeable membrane?
  1. Water moves into the cell by osmosis.
  2. Water moves out of the cell by active transport.
  3. Solute moves into the cell by diffusion.
  4. Water moves out of the cell by transpiration.

Answer: A. Water moves into the cell by osmosis.

Distilled water has a higher water potential than the cell sap, so water enters the cell by osmosis.

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