No. They can not see in ultraviolet light. They are known to glow when exposed to ultraviolet light, though.
No, the human cannot see ultraviolet rays with the naked eye.
nope
Yes, which is how bees can navigate (using the sun as a reference) even on a cloudy day, because ultraviolet light passes through clouds. Just as we see the sun in a blue sky background on a clear...
no, because ultraviolet rays are just above seeing and with ultraviolet lights, you see a more violet color.