Question

how is Literacy a very important quality of a population and how levels of literac an obstacle

Answer 1

According to the Census 2011 data, a person aged 7 years and above who can read and write with understanding in any language is treated as literate.
Literacy is considered very important for the quality of a population because of the following:

Only a well-informed and educated citizen can make intelligent choices and undertake research and development projects.

Low levels of literacy are a serious obstacle for economic improvement.