This document contains 25 science questions for a 9th grade class exam. The questions cover topics like pure substances, health conditions, tissues, atomic structure, crop production, stomata functions, organism classification, amphibian and reptile differences, phloem constituents, molecular mass, food and health, the greenhouse effect, homogeneous and heterogeneous mixtures, soil fertility, Bohr's atom model, electron configuration in sodium, atom definition, factors affecting crop production, cloud formation, preventing infectious diseases, and classifying elements, compounds and mixtures. The exam has a maximum score of 60 marks.