newspaper reports about the alarming increase in pesticides level in packed food items has resulted in some states banning these food items.
a)what are the sources of these pesticides in the food items?
b)why is a vegetarian diet suggested for humans with this respect?

1.The pesticides that are used by farmers to kill insect, pest etc is responsible for banning of these food items. When pesticides are used at the time of growing of plants, they get penetrated into the plants that are used as packed foods etc.
2. Vegetarian diet is preferred over packed foods as this will prevent the biomagnification.

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the sources are the plant pesticides 
a vegetarian diet is preferred as directly eating plants would not lead to a lot of concentration of these chemicals compared to concentration of chemicals due the phenomenon of biological magnification 
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