Cambridge International AS Level Biology 5 a Name three cell types found in:
1 xylem
ii phloem
b State the functions of the cell types you have named.
6 Arrange the following in order of water potential. Use the symbol > to mean 'greater than
dry atmospheric air; mesophyll cell; root hair cell; soil solution; xylem vessel contents
Figure b shows changes in the tension in the xylem of a tree during the same period.
7 Figure a shows changes in the relative humidity of the atmosphere during the daylight hours of one day.​