The 2023 G.C.E. (A/L) Biology Paper I, held in early 2024 by the Department of Examinations, Sri Lanka: 50 multiple-choice questions in two hours. In questions 41–50 one or more of the responses (A) to (E) may be correct: choose (1) if only (A), (B) and (D) are correct, (2) if only (A), (C) and (D), (3) if only (A) and (B), (4) if only (C) and (D), and (5) if any other response or combination is correct. Answers are from the official marking scheme, which accepts any answer for Q30 (the cross AaBb × AaBb gives nine genotypes, which is not among the options) and either (1) or (5) for Q42. No figures. The text is from the English-medium paper. Each question links to the lesson it tests.