The number of stomata on the lower and upper surfaces of two leaves from plant species x and y were counted under the field of view of a light microscope. The results were as shown below.
| Leaf || Number of stomata || |
| || Upper surface|| Lower surface|
| x|| 4|| 12|
| y|| 20|| 23|
- Which of the two leaves would be expected to have a lower rate of transpiration?
- Give a reason for your answer in (1) above.