(a) State three ways in which science and technology have contributed to agricultural 
development through each of the following: 
              (i)           Crop protection; 
              (ii)          Climatology and meteorology.                             [6 marks] 
(b) Give two functions of each of the following farm machines and implements: 
              (i)           bulldozer; 
              (ii)          combine harvester; 
              (iii)         tractor; 
              (iv)         sprayer;

                (v)           planter. -                                                      [10 marks]