Is it true that organic food contains no chemical residues?

It is easy for us to believe that organic food is free of chemicals, since the farmer does not use any synthetic pesticides or fertilizers. But the fact is that nature is full of chemicals. Cabbage contains 49 natural chemicals, for example. Most of these 'natural' chemicals are good for you, but some of them are not. The plant produces them to protect itself against insects and diseases - fortunately, in such low quantities that they pose no real danger. Besides, in some cases organic food does contain manmade chemicals. These are derivations of chemicals naturally produced by plants or animals to protect themselves, or that are present in the environment anyway, such as the natural fly-killer pyrethrum.