How much?
what kind of plywood floor?
Why do you need to do this??
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Plywood, fiberboard, or cement board is the best underlayment for floors, depending on the type of floor being installed. An underlayment provides more stability and a smoother surface to the finish floor.
Many 'industrial' adhesives available in 'caulk' tubes will glue plywood to cement. PL Premium is one of the best.
If it sits over a cement floor, then no. If it is a nailed down floor, then you can, but you still have to install a cement board.
It would depend on the type of floor you are installing. There haven't been enough details about the project provided to answer this question thoroughly. If you are installing engineered hardwood just lay down a 3/4" piece of plywood and a moisture barrier. If you are installing a floating floor, use a moisture barrier and two 1/2" pieces of plywood. see related links
No, luan is a plywood and wood is naturally porous.