Question

Locate the participial phrase and the word modified. The ship, buffeted by the storm, struggled to safety.

Answer 1

The participial phrase includes the participle and the object of the participle or any words modified by or related to the participle. 
1. PP: buffeted by the storm 
WM: ship 
2. P: injured 
O of P: Joe 

Answer 2

The participial phrase is buffeted by the storm.
The word modified is ship.
The answer could've been derived by carefully examining the sentence and the question...