My sister is a baker. She bakes mostly cakes and pies and other pastries.
A baker is someone who bakes 
Yes, like my sister. Haha! What else do you know about baking?
It has to do with breads and other products made using an oven 
Definitely. My sister can make some of the best pastries in the area!
Ok , that's good Since grains have been a staple 
I'm not sure what that means. But yes grain is important in certain areas of baking for sure.
That is agricultural term, grain quality depends the make