Question

why were seats reserved for SC and ST in the parliament

Answer 1

seats were reserved for SC and ST in parliament because at time of independence uppercast don't allow SC or ST to participate in elections and won them and they were taken as untouchable, so to remove this discrimination between SC and SR and other castes seats were reserved for them

Answer 2

Therefore, some seats are reserved in the Parliament for SC and ST communities. This has been done so that the MPs elected from these constituencies will be familiar with Dalit and Adivasi interests in Parliament and can represent them.

I Hope it will be helpful