An investigation was carried out into the effect of light intensity on the rate of transpiration. All other variables were standardised. A student was asked to explain the results shown in the graph below.
Which explanation is correct?
At light intensities above 30au the stomata close rapidly.
2 )
The rate of transpiration increases as the light intensity increases.
3 )
The rate of transpiration never falls to $0c{m^3}$ because some stomata are always open.
4 )
Water uptake by the plant increases as the light intensity increases from 0 to 30 au.
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