Cambridge Progression Test Stage 7 Science 2023 Paper 2

1. Biology: characteristics of life (MRS GREN), virus non-living criteria, respiratory system (cell → tissue → organ), decomposers in composting, photosynthesis vs gas tests (O₂, CO₂), sound model using rice vibrations, food chain energy transfer.
2. Chemistry: particle model (solid vs gas compression and shape), gas identification (O₂ relights, H₂ pops, CO₂ cloudy limewater), hazard symbols and compound properties, precipitation and neutralisation, metal vs non-metal property evidence.
3. Physics: current in series circuits (ammeter use, graphing current vs lamp number), sound reflection (echo), hearing model, gravitational force in orbits, tidal force by alignment, lunar eclipse condition and explanation.
4. Earth science: water cycle modeling (evaporation, condensation), model limitations, gravity on different planets (mass-gravity link), tidal explanation with Sun-Earth-Moon diagrams, lunar orbit eclipse prediction.
5. Scientific method: graph plotting (straight-line best fit), pattern description, controlling variables in compost investigation, fair testing improvements, repeating for reliability, inferring reactions from heating color change and gas emission.
6. Data interpretation and logic: dichotomous keys, classification, force effect in vacuum vs air (drag), identifying powder reactions, using periodic table for property prediction, evaluating contradictory hypotheses based on data.