Concept:Piercing and sucking insects have special mouthparts that pierce plant tissues and suck out sap.Explanation:The mealy bug feeds by piercing plant tissue and sucking the sap.Grasshoppers have chewing mouthparts and bite plant leaves.Weevils also have chewing mouthparts and feed by biting.Termites chew wood and plant materials.Therefore, only the mealy bug is a piercing and sucking insect-pest.Answer:A. mealy bug