Grade 9 NATURAL SCIENCE Revision (Term 3) Graded A+

Grade 9 NATURAL SCIENCE Revision (Term 3) Graded A+ What is the role of chlorophyll in photosynthesis? It captures light energy for the plant. How do fish breathe underwater? They use gills to extract oxygen from water. What is the primary function of a flower in a plant? To facilitate reproduction through pollination. What is the term for the change of state from gas to liquid? Condensation. What process do plants use to absorb sunlight and convert it into chemical energy? Photosynthesis. 2 What are the two main types of cells in living organisms? Prokaryotic and eukaryotic cells. What is the primary function of the immune system? To defend the body against pathogens and disease. What phenomenon explains how sound travels through different media? Sound waves need a medium to propagate, like air or water. What is the term for a trait that helps an organism survive in its environment? Adaptation. What type of energy transformation occurs in a battery when it powers a device? Chemical energy is converted into electrical energy. What do you call the flow of energy through a food chain? Energy transfer. 3 What is the primary purpose of the skeletal system in animals? To provide structure and support. How do enzymes affect chemical reactions in the body? They speed up reactions by lowering activation energy. What is the difference between renewable and non-renewable resources? Renewable resources can be replenished naturally, while non-renewable resources cannot. What is the term for the process of maintaining stable internal conditions in an organism? Homeostasis. What type of energy is associated with an object’s position? Potential energy.