Integrated Science - WASSCE Liberia
Integrated Science - WASSCE Liberia
Integrated Science tests unifying ideas from biology, chemistry, physics, and earth/health science. Expect objective items on definitions and processes, and theory questions that ask you to explain, compare, or interpret data. Practical-style questions reward accurate observation, correct units, and controlled-variable language.
Core rules and concepts
- Scientific method: state a hypothesis, identify independent and dependent variables, and keep other variables constant.
- Measurement: use SI units - metre, kilogram, second, ampere, kelvin, mole - and choose the instrument that matches the precision needed.
- Matter: distinguish physical changes from chemical changes; use filtration, evaporation, distillation, and chromatography for separations.
- Living systems: relate cell structure to function; know photosynthesis and respiration as complementary processes.
- Energy: describe transfer and transformation, and use simple circuit and force ideas.
Worked example
A car travels 150 m in 10 s. Average speed = distance ÷ time = 150 m ÷ 10 s = 15 m/s. To convert to km/h, multiply by 3.6: 15 × 3.6 = 54 km/h. Showing the formula, substitution, unit, and conversion earns method marks; writing only “15” does not.
Traps that cost marks
Confusing mass with weight; reversing photosynthesis and respiration; forgetting to state the controlled variable; mixing up separation methods; using the wrong unit; and describing an observation as an inference.