The diagram below illustrates an experimental set-up on soil. Study it and answer the questions that follow.

 

a) (i) State the aim of the experiment. 

(ii)Name the parts labelled I and II in the diagram. 

 

b) Describe how the experiment is carried out. 

 

c) State four properties of sandy soils. 

 

 d) Describe a test for soil acidity using litmus paper.