7. Why is the prolonged use of DDT not desirable!
8. Which type of irrigation method will be best for dry regions such as desert? Givea
suitable reason.
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Ans7- The prolonged use of DDT is not desirable because it has adverse effects on the environment. ... DDTstands for Dichlorodiphenyltrichloroethane and was primarily discovered as an insecticide. However, it is also likely to be carcinogenic and thereby poses a threat to life on Earth.
Ans8- tube well is the best method of irrigation in dry region such as desert.. 1). due to very low water table on very large land.
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