1.

Define the term pesticides? What are three categories of pesticides?

Answer»

Pesticides are substances which are used to kill or block the reproductive process of unwanted organisms. 

The three main categories of pesticides are:

(i) Insecticides: These are used to control insects and curb diseases and protect crops. 

(ii) Herbicides: These are used to kill weeds .Example- sodium chlorate (NaClO3), sodium arsinite(Na3AsO3

(iii) Fungicides: These are used to check the growth of fungi. Example-methyl, mercury. 



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