Project defense is one of the requirements and the only way to graduate in Nigerian Universities. It is a way to at least defend what you have written (or copied and paste) in a convincing manner. The truth is that it is better to be more confident with a poor content, than to be unable to defend an excellent research work.
The following tips will help on what to do before the defense day, on the defense day, and inside the defense room:
Tips before your Defense Day
On the Defense Day
In the Defense Room
NOTE: While answering your questions look straight into the eyes of panel members, and never be rude.