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WAEC WASSCE Biology 2023 past questions and answers

This 2023 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 2023 set with instant marking.

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Sample WAEC WASSCE Biology 2023 questions

1. Which feature of the small intestine most directly increases the rate at which digested food is absorbed?
  1. Numerous villi that provide a large surface area
  2. A thick muscular wall that prevents diffusion
  3. A layer of dry keratin on its inner surface
  4. A narrow lumen that slows the movement of food

Answer: A. Numerous villi that provide a large surface area

The numerous villi and microvilli provide a large surface area for absorption.

2. In which part of a mammalian nephron does blood ultrafiltration begin?
  1. The collecting duct
  2. The glomerulus
  3. The loop of Henle
  4. The distal convoluted tubule

Answer: B. The glomerulus

High pressure in the glomerular capillaries forces water and small solutes into Bowman's capsule.

3. Which tissue transports manufactured sugars from leaves to other parts of a flowering plant?
  1. Epidermis
  2. Xylem
  3. Phloem
  4. Cortex

Answer: C. Phloem

Phloem translocates soluble products of photosynthesis from sources to sinks.

4. What happens to the diaphragm during inhalation in a healthy human?
  1. It relaxes and moves upwards
  2. It remains fixed while the ribs move downwards
  3. It contracts and becomes dome-shaped
  4. It contracts and flattens

Answer: D. It contracts and flattens

Contraction flattens the diaphragm, increasing thoracic volume and drawing air into the lungs.

5. Which substance is produced when salivary amylase acts on starch?
  1. Maltose
  2. Amino acids
  3. Fatty acids
  4. Glycerol

Answer: A. Maltose

Salivary amylase hydrolyses starch into the disaccharide maltose.

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