Cambridge Progression Test Stage 7 Science 2020 Paper 1

1. Biology: structure size hierarchy (organ system to cell), water cycle processes (evaporation, condensation, precipitation), food web completion (Amazon rainforest), decomposer roles, primary consumers count, penguin species classification via dichotomous key.
2. Chemistry: magnesium-oxygen reaction forming magnesium oxide, particle models for gases and solids, air composition (pie chart analysis), gas increase from deforestation (CO₂), neutralisation experiment (acid + alkali), pH change interpretation, indicators (e.g., Universal Indicator).
3. Physics: energy transfer (light, sound, heat), energy conservation calculations, sound wave modeling (Slinky, regions of compression/rarefaction), lunar eclipse diagram identification, circuit component completion, electric conductor/insulator test.
4. Earth science: Earth′s internal structure modeled with clay (strengths and limitations), element and compound classification, Moon-Earth-Sun alignment, Earth gas percentages.
5. Scientific skills: experiment interpretation (acid addition to alkali), reliability of measurement tools (probe vs indicator), experiment improvements, diagram interpretation (electric circuits, food chains, particle arrangements), pattern recognition in pH data.