Cambridge Progression Test Stage 9 Science 2020 Paper 1

1. Biology: human excretory system (kidney, waste filtration model with sieve, sugar, rice, lentils), plant nutrition (magnesium for chlorophyll, nitrates for proteins), gas exchange (CO₂ in, O₂ out), plant spacing benefits.
2. Chemistry: Periodic Table structure (aluminium, fluorine, sodium ions), Group 1 properties (melting/boiling point trends, reactivity), word equations (e.g., zinc oxide + sulfuric acid → zinc sulfate + water), gas identification (hydrogen from metal-acid reactions), separation methods (filtration, evaporation).
3. Physics: circuit symbols and diagram completion (ammeter, voltmeter), conduction and safety in heating metal rods, sound wave interpretation using oscilloscope (amplitude, pitch, frequency), thermal energy in white-hot sparks.
4. Earth science: tectonic plates and continental drift (Africa–South America fit, rock/fossil evidence), models of plate movement (plastic blocks, convection, heat source), tectonic activity at plate boundaries (earthquakes, volcanoes).
5. Experimental science: reaction rate vs acid concentration (plotting graph, curve of best fit), reliability in conduction experiments, risk assessment (heating, wax hazards), anomalous results, scientific modelling (e.g., kidney, tectonics).