Concept:Cultural practices are the operations carried out on a crop in the field after planting, to help it grow well until harvest.Explanation:Mulching, weeding and pest control are all done on the growing crop in the field, so they are cultural practices.Nursing is the raising of seedlings in a nursery before they are transplanted to the field. It is a pre-planting operation, so it is not a cultural practice.Answer:Option A (nursing)