Question

why is it important for granaries to be clean and dry

Answer 1

$\textbf{Hey.. mate here's yur ans..}$
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granaries should be kept dry in order to prevent the spoilage of the harvest. Because, microbes can grow in damp environment. To keep granaries cleanis important to keep the harvest hygiene.
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Answer 2

This is mainly because of they are not clean, insects and rats may feed on the grains. The place will become unhygienic and the grains will be unfit for consumption. They should also be dry as the moisture present in them will lead to the growth of pathogens.