Is each lung fed oxygen by a different bronchus?

Yes, each lung is fed oxygen by a different bronchus. The right lung is fed by the right primary bronchus, which branches off from the trachea just below the larynx. The left lung is fed by the left primary bronchus, which branches off from the trachea just below the right primary bronchus. The primary bronchi then branch into smaller bronchi, which in turn branch into even smaller bronchioles. The bronchioles eventually lead to the alveoli, which are the tiny air sacs where gas exchange takes place.