k dude, first off, you should be lucky that your mother is asking you so many questions this obviously shows that she cares for you. Not many people have mothers which care for them much as you do. Secondly its natural for a mother to do this since since mostly all females are caring to their own, its a natural instinct which the cannot be avoided.
Consider yourself lucky to have a caring mother m8. Give her respect to the maximum and if your finding it annoying then you need to change your attitude. She went through birth and bringing you up which can never be repaid no matter what you do - your forever in her debt. Respect your mother.