Is bell's palsy the result of a stroke?

No. Bells palsy only refers to facial paralysis with an unknown cause although it may be due to a viral infection. A stroke can cause facial paralysis but this is not called bells palsy.
No. Viral infection is one aspect to facial nerve paralysis leading to bells. Stress and irritation to the facial nerve can also cause this. Chinese acupuncture can help to reduce the duration of paralysis.
No. Facial paralysis may be part of a stroke but bells palsy is a viral inflammation of the facial nerve which leads to facial paralysis.