Final answer:
Leaving food uncovered is not a proper pest control practice, as it attracts pests. Effective methods include sealing entry points, removing standing water, and maintaining cleanliness.
Step-by-step explanation:
The practice that is NOT proper for preventing and controlling pests is D. Leave food uncovered. Leaving food uncovered can attract pests and provide them with a food source. Proper practices for pest management include A. Seal entry points to deny pests access to the structure, B. Remove standing water to reduce mosquito breeding grounds, and C. Maintain cleanliness to eliminate potential food and shelter for pests. It's also essential to implement control measures such as biological control, which is the use of organisms to control pests, rather than harmful chemical pesticides.