Independent variable - pH level Dependent variable - Time taken for starch to be broken down. Control variables - Temperature, volume and concentrations of enzyme solution and starch solution.

Death Cab for Cutie front man Ben Gibbard describes the destruction left by a powerful storm in the Seattle-area as a 'sight ...

The green parts contain chlorophyll and photosynthesise to make starch. The white part of the ... Only the uncovered parts become blue/black with iodine solution, showing the importance of light ...