If the rates of transpiration and water absorption of a flowering plant are measured over a period of twenty four hours, it is found that the rate of transpiration reaches its peak at about mid-day and then declines, whereas the peak for water absorption is reached approximately two hours later. Which one the following statements provides the best explanation of these results

Question

Accepted Answer

The high rate of transpiration causes a water deficit which results in stomatal closure and an increased concentration of leaf cell sap, which in turn causes continued water uptake

Answer

There is a temporary reduction of light intensity at mid-day, which reduces the rate of transpiration

Answer

Water absorption is mainly due to root respiration and this is affected by soil temperature, which does not reach a maximum for some hours after the maximum air temperature has been reached

Answer

The high light intensity results in high internal oxygen concentrations and so increase water uptake

plant-water-relation

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