It will definitely die.
I guess it depends on the worm but earthworms and such don't bite.
It crackles and pops. You would probably have to get a new microwave if you attempted this at home.
If the microwave is not energized, then the food will spoil. If the microwave is energized, then the food will burn.
nothing would happen the microwave does not know if there is anything in there or not.
Pin worm
It dies.
Who knows - the concept of a worm hole is still a hypothesis.
Nothing
Boom.
it gets nuked
Putting things with metal in a microwave causes sparks to fly.
... It dies