Cambridge Progression Test Stage 5 Science 2025 Paper 2

1. Flower Structure and Life Cycle: Stamen = anther + filament; pollination from anther to stigma; petals attract insects; ovary forms seeds; life cycle: germination → pollination → seed production → seed dispersal.
2. Water Properties: Boiling point 100°C, melting point 0°C; water is a universal solvent and has high specific heat capacity—used widely in cooling and biological systems.
3. Sound and Vibration: Sound from vibrating elastic; tighter elastic = louder, higher pitch; thicker elastic = lower pitch; pitch and volume depend on tension, thickness, and force.
4. Evaporation and Fair Testing: Adding salt slows evaporation; fair test via equal water volume; 4g salt = 17 hours longer; equipment: measuring cylinder (water), balance (salt).
5. Solutions and Reversibility: Salt (solute) + water (solvent) = solution; dissolving reversible by evaporating water; solution = homogeneous mixture of solute in solvent.
6. Water Cycle, Magnets, and Forces: Evaporation, condensation, precipitation; strongest magnet = one attracting most iron powder (Y); force arrows: weight (down), air resistance (up); larger parachutes fall slower due to increased drag.