Question

what do you mean by political competition is it good for democracy

Answer 1

A political competition may have many limitations such as it can results in factionalism, disunity and use of dirty tricks to win elections.  However, free competitions in elections works better in a longer run. Many political parties prepare their manifestoes in which they point out steps that they will take after they come to power. The voter is in an advantageous situation as he can assess the manifestoes and party policies and decide the party to which he/she wants to vote. In any democracy, elections are based on political competition and absence of competition hampers the working of democratic practices or institutions. 

Answer 2

demerits of political competition :-
it creates a sense of dusunity and party politics
long term policies cannot be formulated