It's indigestible, so yes.
starches; fiber
Fiber, in the nutritional sense, is cellulose, not starch. Starch is not a fiber (even when it is in the form of spaghetti).
preparation of modified tapioca starch using glycerol?
When a food label reads "modified food starch", they are telling you that there is some kind of starch in the product. It could be wheat starch, corn starch, tapioca starch, rice starch, etc. What you should do if you see modified food starch is call the 800 number on the pack of the product and specifically ask them what kind of starch is in that product. In North America, modified food starch is safe for celiacs. In other countries, you must contact to find out which starch it is from.
Beans are full of fiber.
I believe that Chicklets Fruit Flavored Gum is not Gluten Free, because of its Modified Food Starch. When The Ingredients Label lists Modified Corn Starch, that is okay. Or even Modified Food Starch (Corn), is fine. But plain old Modified Food Starch is the thing to avoid if Gluten Intolerant. :)
No !
The difference between starch and midified starch
Nothing at all
It is cheaper.
what is the difference from unmodified wheat and cross-linked starch
There are fibrous foods that do contain starch. Potatoes are an example of a food that contains both starch and fiber.