Question

why do you think we have a system of reserved constituencies in india? what purpose does it serve?

Answer 1

system of reserved constituency has a special purpose to serve as :
to promote equality among castes

Answer 2

System of reserved constituencies are very important in india because if there will no reserved constituencies then SCs and STs cannot win the constituencies because rich people will not allow SCs and STs to hold constituency. 84 seats are reserved for SC and 47 for ST.
It helps them to raise the voice of significant section of our society