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Corn will not pollinate correctly if it is not in a rather dense clump. If you grow it in your garden you should plant 3 or more rows(or a square/circle). Otherwise you will get mostly empty cobs.

3 rows is not nearly enough. I grow corn, and even with 9 rows, 20' each (roughly a 20'x20' square, with nearly 200 plants), I still hand polinate (takes about 5-10 minutes every 2-3 days once you start seeing silk). I doubt that most home growers will get anywhere close to enough density for good wind pollination, but hand pollination is not that hard.

Corn is wind pollinated and having a lot of plants around decreases the chance of self-pollination and increases the chance of outbreeding enhancement.

Good question, but I don't know.

I'd guessing lots of other warm season grasses which need not be corn. Most gardens grow many things that are not warm season grass. That is plants that don't grow very tall.