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 easier to detect aromas. The glass is then swirled whilst warming the whisky with the hand and the nosing process repeated. The whisky is tasted, often a little at first, and then in larger amounts and with the spirit being moved around the tongue and swallowed slowly. The purpose of the first tasting is to appraise the texture while subsequent tastings are to analyse flavours and scents. In the second tasting the primary flavours are determined. There are only four of these, detected by the tongue: salt, sweet, sour and bitter; the other 'flavours' are aromas and are picked up