Question

why did British conduct so many surveys in india

Answer 1

to proove the indians that they are good and they like to devolop india

hope it is helpful 
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Answer 2

The British conducted surveys for a better kind of administration . They wanted everything to be perfect . So, they wrote down and preserved such documents which were useful for them . In this time period they conducted many surveys such as - Archaeological surveys , Botanic surveys, animal surveys, population surveys (census) etc.