Contribution of resonance & articulation to safe and effective performance?

Hi, I'm having my trinity grade 7 speech and drama examination tomorrow. The syllabus states that there will be a discussion with the examiner on "the contribution of resonance and articulation to safe and effective performance". I really do not know how to explain it! What would you say if you are going to be in my shoes? And can you please provide me some useful links concerning theory in the trinity speech and drama exams(including relaxation techniques, intonation & inflection etc.)? Thanks a bunch!