First of all, whether the paper can pass or not is the key. The overall structure, logic, experimental design, conclusion and even typos of your paper are very important.

Secondly, the tutor, whose opinion really carries weight. You should review well according to the requirements of your tutor, and don't be cocky.

Third, it is defensive play. There is a routine for answering questions, so it is necessary to find out whether it is written by yourself. Ask you the important concepts first, and then ask you the logic and experiment or model design of the paper. Some key issues are really familiar to me. However, if you are nervous in your defense, the expert looks so serious and fierce.

Finally, look at popularity. If you are in college or your tutor is too unpopular at school, it is estimated that it will have some influence. But I think if the paper is ok, it can't be groundless any more.