Every univ. has a different question paper format, so it is difficult so say what they expect unless you post a sample question paper.
In general, for a long answer question, assuming that you get 30 minutes to answer, you should write the following things under appropriate heading -
1. Definition or brief descripttion + example 2. Essential Elements 3. Exceptions and special situation 4. Important case law that relates to the interpretation of the provisions.
You might want to check out the Study Notes section under Academics at www.hanumant.com to see answers to long answer type questions.