It shall be unlawful for any public market to represent that livestock, poultry, and other agricultural and horticultural products are being sold at such market on grades, classifications, or standards adaptable to such products unless such grading, classifying, or standardizing has been made or approved by a person licensed by the commissioner. Applications for such a license shall be made on forms furnished by the commissioner and shall be accompanied by a fee of $2.50 and shall contain such information as may be required.