How is the use of insecticides like DDT and BHC harmful to the plants

1.	How is the use of insecticides like DDT and BHC harmful to the plants and the soil?
Answer» Solution :(i) They are absorbed by the SOIL and contaminate root CROPS like radish, carrot etc. (ii) Their repeated use produces a RESISTANCE in the pests and hence they BECOME INEFFECTIVE

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