(a(i))[1]
State one feature, visible in the diagram, that shows the root hair cell is a plant cell.
(a(ii))[4]
Describe how mineral ions pass from the soil into the root hair cell.
(b)[2]
The lemon tree has been growing in the same soil for many years, so the soil is now short of magnesium. Describe and explain the effect on the lemon tree of a lack of magnesium.