1) why is it important for granaries to be clean and dry?

2)why does a farmer grow pea plants with wheat crops?

In the first case, granaries should be kept dry in order to prevent the spoilage of the harvest. Because, microbes can grow in damp environment. To keep granaries clean is important to keep the harvest hygiene.

A farmer grows pea plants which are legumious plants along with wheat plants which is a rabi crop in order to satisfy the demand of nutrients to grow crop. AS pea plant contains Rhizobium bacteria, it produces nitrates essential for the growth of crops. Also, the farmer can save money too !