Yes, bicycle or electric scooty can be used if distance is more than 1km.
Within 1km. walk is better to keep ourselves physically fit.

Yes, up to large extent (not 100%, if you are living in city).
Generally in the homes of Jains cleanness is maintained so that such a small insects dont take birth.
Instead of using hit and bagon, you can use mosquito net for single

We can switch to natural purifiers such as neem leaves,guggal dhup,camphor.we can reduce the use of resources by walking ,keeping the vehicles less in number