11th Class Chemistry Environmental Chemistry

  • question_answer 15) What are pesticides and herbicides? Explain giving examples.

    Answer:

    Pesticides: These are synthetic toxic chemical substances which are used in agriculture to control the damages done by insects, rodents, weeds and various crop diseases. The repeated use produces resistance in the pests and thus new substances are to be discovered in due course of time. DDT, BHC, aldrin and dieldrin have been tried as insecticides. Now-a-days, organophosphates and carbamates have been in use as insecticides. Herbicides: These are the chemicals used to control weeds. Previously, sodium chlorate and sodium arsenite were used but these are not preferred these days on account of their toxic nature to mammals. Now-a-days, organic compounds such as triazines are considered as better herbicides.  


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