The first thing I would like to point out is that you should follow the ISO (International Standard) for IVR input. In this case, you should use 1 for Yes, and 2 for No. Zero should never be used for input, under the ISO, it is strictly reserved for operator/assistance access.
As for your question, it would be a simple case of sending the caller to the QuestionX OGM when they press 1 and the QuestionY OGM when they press 2. On those question OGMs you can then decide to continue to flow out into separate sets of OGMs or have them continue on with the same set of questions. It also depends how you have your survey set-up, are you recording the answers to a database using a plug-in or logging them using log feature in the advanced tab?