I cannot see this feature on my end but several online sources are indicating that Google search results now show an option to ask the searched query on Google Plus.
The option basically opens up a new share box that you can use to post the same question on your Google Plus stream.
The idea is to ask your social connections when you cannot find the resolution on regular Google search result pages.
We are not sure if this is just a limited test right now or Google plans to open it to all Google Plus members in the future.
Google Plus does not have any special feature for questions or polls. Maybe they would soon add one that would complement this new feature on their search engine.