what is the meaning of breeding,sorting and grading

							
Food grading involves the inspection, assessment and sorting of various foods regarding quality, legal conformity and market value. Food grading occurs by hand, in which foods are assessed and sorted. Machinery is also used to grade foods and may involve sorting products by size, shape and quality. For instance, machinery can be used to remove spoiled food from fresh product.
Coffee growers, traders and roasters grade beans based on size, colour and a variety of other characteristics. Coffee of exceptional quality is traded as ‘special coffees’ and fetches a higher price in international market.
After the roast, Coffee grading involves assessment of roasted coffee seed colourization and then labeling as light, medium light, medium dark or very dark. A more accurate method of discerning degree of roast involves measuring reflected light from roasted seeds illuminated with a light source in near infrared spectrum. This elaborate light meter uses a process called spectroscopy to return a number that consistently indicates roasted coffee’s relative degree of roast or flavor development.