Infection And Response Practice Test

Diseases in animals and plants can spread through several routes, not just one. The best answer recognizes three major pathways: direct contact, water, and air. Direct contact allows pathogens to move when a healthy host touches an infected one or comes into contact with contaminated secretions or tissues. Water serves as a vehicle when pathogens are carried in drinking water or through water splash and runoff that reach other hosts. Airborne transmission includes droplets or aerosols produced by an infected organism that can be inhaled or settle on surfaces, enabling spread even without close contact. Because all three routes can contribute to spread, this option best captures how diseases move between individuals and plants in real-world settings. The other options are too limited, describing only one route and missing the others.