WAEC Biology 2025 Papers

Concept:The adult human dental formula is written per half of each jaw, not for the whole mouth in one line.Explanation:The permanent human dental formula is:$$\frac{2}{2}:\frac{1}{1}:\frac{2}{2}:\frac{3}{3}$$This means each half of the upper and lower jaw has 2 incisors, 1 canine, 2 premolars and 3 molars.So in each full jaw, humans have 2 pairs of incisors, 1 pair of canines, 2 pairs of premolars and 3 pairs of molars.Option C correctly says that the upper jaw has 2 pairs of incisors and the lower jaw has 3 pairs of molars.Options A, B and D contain false statements, such as 3 pairs of premolars on the lower jaw or 4 pairs of molars on the lower jaw.Therefore, C is the correct statement, not an incorrect statement.Answer:As the question is worded, there is no single incorrect option: options A, B and D are incorrect, while option C is correct.If the intended question was “Which statement is correct?”, then the answer is option C.