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No, they are made, taste, and taste differently.
No. Crushed ginger is 'wet'. Ground Ginger is a powder. They are not the same thing. You can substitute but would need to change quantities and the taste would be different.
The tangled, beige root is used medicinally. The root has a sharp, pungent taste and aroma.
Stem ginger is taken fresh and preserved in sugar syrup. It has a different taste than root ginger which is usually allowed to dry somewhat and is grated or ground and put in to dishes and also a very famous cola #1.
Ginger ale is actually made from the ginger root.
garlic
vegetative propogation
Yes, ginger is a tuber.
probably. my guess is that ginger root is the whole thing, and ground ginger would be chopped up/finely ground ginger root.
Yes, a ginger has a tap root.
Ginger is a spice
If your recipe asks for Ginger root, it is the actual root you find in the produce section, that is is asking you to use. in some recipes it is for the flavor, but often ginger has a medicinal characteristic. If you have powder, that is the dried and ground form of the root, and it will not be the same measurement. It also depends on what you are making- if you can substitute the powder for the root.