1) Could you explain how symmetries (global or local) are related
to the conservation laws in physics. Please give example of local
gauge symmetry and resulting conservation law.

2) SU(3) flavour symmetry: could you explain what does it mean,
what are the consequences. 

3) What is the cross-section for qqbar-> qqbar scattering.
Explain what does it mean  SU(3) colour symmetry and what
are the consequences for Feynman diagrams vs QED ones.

4) What is the origin of the running couplings in QCD and QED.
Could you explain qualitatively how they behave with increasing
energy scale.

5) What does it mean V-A structure of weak interaction.
What is the evidence for V-A structure?