Describe4 marksStandard
A student investigated the action of amylase on starch. Amylase was added to a starch solution at 30 °C. At intervals, a sample was removed, iodine solution was added, and the absorbance was measured using a colorimeter. A higher absorbance indicates a more intense blue-black colour (more starch present). The results are shown in the table.
| Time / min | Absorbance / arbitrary units |
|---|---|
| 0 | 1.00 |
| 2 | 0.78 |
| 4 | 0.55 |
| 6 | 0.35 |
| 8 | 0.20 |
| 10 | 0.10 |
Describe the results shown in the table and explain them in terms of the mode of action of amylase.