Which relationships could be investigated using a colorimeter?
1) the effect of light intensity on the rate at which a solution of a light-sensitive dye changes from green to colourless
2) the effect of temperature on the rate of breakdown of cell membranes in tissues with pigmented cells, such as beetroot (red beet)
3) the effect of pH on the rate of release of oxygen from the breakdown of hydrogen peroxide by catalase
4) the effect of light intensity on the rate of change of skin colour of lizards that become paler in bright light
1 )
1, 2, 3 and 4
1 and 2 only
3 )
1 and 4 only
4 )
2 and 3 only
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