Root plant to fuel the process. In return, the plant takes nitrogen compounds produced from ammonia by the bacteria. The term root crops refers to any edible underground plant structure, but many root crops are actually stems, such as potato tubers. Edible roots include cassava, sweet potato, beet, carrot, rutabaga, turnip, parsnip, radish, yam and horseradish. Spices obtained from roots include sassafras, angelica, sarsaparilla and licorice. Sugar beet is an important source of sugar. Yam roots are a source of estrogen compounds used in birth control pills. The fish poison and insecticide rotenone is obtained from roots of "Lonchocarpus" spp. Important
Whisky tasting books, leather and possibly tobacco aromas. No two noses are the same, however: one may be more sensitive to a particular aroma than another and sometimes a nose might be unable to detect a certain smell at all. This phenomenon, known as nose-blindness, is why tasting notes are best compiled by a panel of three or more. The whisky glass is held at a 45 degree angle, often against a white background, to give a clear view through the spirit. The depth of colour is largely determined by the cask the whisky has been conditioned in: Spanish and European oak