How is spraying different from fumigation?

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SprayingFumigation
$(i)$ The process of applying pesticides in liquid form,either manually or by machines,is called spraying.$(i)$ The process of using pesticides in gaseous or vapor form to control pests is called fumigation.
$(ii)$ Pesticides are used in larger volumes and are generally not applied directly to stored grains.$(ii)$ Pesticides are used in smaller volumes and are applied directly to stored grains to eliminate pests.

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The preventive and control measures which are used before grains are stored for future use include:

$(i)$ What are weeds? Give two examples.
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