Question on the tasting grid

Hi, I have my exam in just over a week and when I am practicing filling out the Cert exam tasting grid I always struggle to write a few words next to the: Explain Why box next to the primary grape section, should I just repeat what I filled in above i.e. if I select Malbec it is because of the tannins, primary flavors etc.

Also for the origin: New World vs. Old for me it is always whether the fruit is tart or not. Would they be expecting more?

Finally, for type of climate I know this is general and is not always true, however for a hot climate I tend to go with a higher alcohol as a region as well as riper fruit. However I know there are many cases where this is not true. 

What is expected to be written in these sections? Thank you in advance, getting nervous...