Question

differentiate between public limited company and co-operative organisation

Answer 1

A public limited company is one that is listed on the stock exchange and where any member of the public can buy and sell shares. For example, Rolls Royce..... 
A co-operative organization is a gathering of individuals or small companies where they pool their resources and try to get the benefits of a large company that way. For example, it is very common for farming communities to operate this way so that small farmers can buy tractors or bulk-buy fertilizer and help each other out generally.