Final answer:
Cartridge respirators worn for safety when applying pesticide function to filter out pesticide dust, droplet particles, and vapors.
Step-by-step explanation:
The function of cartridge respirators worn for safety when applying pesticide is to filter out pesticide dust, droplet particles, and vapors. These respirators have cartridges containing filters that capture and trap harmful particles and chemicals present in the air, preventing them from entering the wearer's respiratory system. The purpose is to provide a safe breathing environment while working with pesticides.