They are the ingredients of their culture & heritage
... whose culture? Nothing said before this refer to "their"
For every ceremony or ritualsritual
For every ceremony or rituals there is a specific & logical reason
Behind every ceremony or ritual, there is a specific and logical reasoning.Yes we need rituals & ceremonies to help us to define ourselves socially & culturally.
. On the same day the ravana was killed.
.... your examiner may not know who ravana is... you better describe him.
By celebrating it we are defining it socially & culturally.
.... well.... this conclusion lacks logical reasoning. You just make this statement without giving convincing arguments for the reader to believe what you say.