you can grow wheat in a field but if you want to raise bread, yes, wheat is an ingredient, but it's the yeast that makes the bread rise.
Yes, it's made with whole grain wheat, along with several other ingredients.
Yes
Wheatgrass essentially IS wheat (wheat greens, that is). However, it contains no wheat gluten if that's what you're afraid of. You can probably eat it even if you have a wheat allergy.
make bread