Which statement best describes an exclusion barrier?

Which statement best describes an exclusion barrier?

• A. It uses chemical repellents to block entry
• B. Physical barriers such as door sweeps, caulking, and sealing gaps prevent pest entry
• C. It relies on traps placed outside
• D. It refers to wearing protective clothing

Answer: (B)

Exclusion barriers aim to keep pests out by blocking their access points. Physical barriers like door sweeps, caulking, and sealing gaps create a continuous shield that stops entry at typical routes into a building. That’s why this description best fits an exclusion barrier: it focuses on preventing access rather than dealing with pests once they’re inside. Chemical repellents deter but don’t seal entry, traps outside are for capturing or monitoring rather than preventing entry, and protective clothing isn’t about pest entry at all.

Exclusion barriers aim to keep pests out by blocking their access points. Physical barriers like door sweeps, caulking, and sealing gaps create a continuous shield that stops entry at typical routes into a building. That’s why this description best fits an exclusion barrier: it focuses on preventing access rather than dealing with pests once they’re inside. Chemical repellents deter but don’t seal entry, traps outside are for capturing or monitoring rather than preventing entry, and protective clothing isn’t about pest entry at all.