IB Biology Extended Essay Exemplar: How do varying concentrations of potassium nitrate (KNO3) (0.0 g/dm-3 (control), 25.0 g/dm-3,75.0 g/dm-3, 125.0 g/dm-3, 175.0 g/dm-3, and 225.0 g/dm-3(±0.5 g/dm-3) affect the stem heights of Phaseolus vulgaris (bean plants), measured in mm (±0.05 mm) in a span of 14 days? | RevisionDojo