Agricultural commodities are graded using the AGMARK system. AGMARK is a certification mark issued by the Government of India to ensure that agricultural products meet certain quality standards. This grading system helps buyers and consumers to make informed choices based on the quality of the product. AGMARK grading involves a thorough inspection of the agricultural commodity, including factors like size, shape, color, weight, texture, and chemical composition. It ensures that the products are of a consistent and acceptable quality. The AGMARK certification mark is recognized and trusted by both domestic and international markets. The other options mentioned in the question, ISI, Eco-products, and Green Product, are not directly associated with grading agricultural commodities.