Multiple choice questions XXXXII — task. Science CBSE, Class 9.

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1. The pesticides need to be replaced because these

Cannot be stored for a long time
Are mostly toxic and non – biodegradable
Cause abnormalities in the target population
Are very costly

2. Heat of damp grain in strong occurs due to

High moisture content and growth of moulds
Infection by insects
Decrease in humidity
Decrease in atmospheric pressure

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