A:AnswerYes it can, if you are adept at carefully taking small things apart. Look in the Lenovo community website for discussion on how it is done. Many have upgraded to 256GB ssd's and some have increased the memory to 8GB.
Try here first:
http://forums.lenovo.com/t5/Idea-Windows-based-Tablets-and/Lenovo-Yoga-11s-SSD-and-RAM-Upgrade-Great-Results/m-p/1195545#M7255