what's the difference between wheat and tares?

Answer 1

When you throw freshly dried wheat in the air wheat falls immediately to the ground and the chaff is BLOWN AWAY

http://web.odu.edu/webroot/instr/sci/plant.nsf/pages/tares
http://www.emjc3.com/helland.htm

Answer 2

wheat is more heart healthy and it packs in a good dose of fiber. Tares are very high in saturated fats and they usually need to be fried in peanut oil to taste good. So the wheat has a better health content. Seriously though this is a parable from the New Testament and essentially means the same as sheep and goats.