A student used a potometer to investigate the effect of wind speed on the rate of transpiration in a leafy shoot. An electric fan was switched on after 6 minutes.
The table below shows the results of this investigation.
| Time (minutes) | Volume of water taken up (mm3\text{mm}^3mm3) - Fan switched on after 6 minutes | Volume of water taken up (mm3\text{mm}^3mm3) - Fan not switched on |
|---|---|---|
| 0 | 0 | 0 |
| 2 | 12 | 12 |
| 4 | 24 | 24 |
| 6 | 36 | 36 |
| 8 | 54 | 48 |
| 10 | 74 | 60 |
| 12 | 96 | 72 |
Calculate the rate of water uptake from 6 minutes to 12 minutes when the fan was switched on.
Use the equation:
rate of water uptake=volume of water taken uptime taken \text{rate of water uptake} = \frac{\text{volume of water taken up}}{\text{time taken}} rate of water uptake=time takenvolume of water taken up
