(a) Complete the table below.            

	Weed Botanical name	Method of dispersal
Goat weed
Siam weed
Water leaf

(b)  List three examples of each of the following factors affecting land availability for  
agriculture:
(i)  physical factors;
(ii) economic factors.   

(c) Enumerate four effects of pollution on agricultural lands and ponds.       

(d) State two ways of minimizing land and pond pollution.