Which pesticides kill pests when swallowed?

Which pesticides kill pests when swallowed?

• A. Stomach poisons
• B. Contacts
• C. Protectants
• D. Sterilants

Answer: (A)

Pesticides that kill pests after they swallow them are stomach poisons. They’re formulated to be eaten, often as bait, and their toxic effects show up after digestion, leading to death. This ingestion route is the defining feature of stomach poisons, setting them apart from other types. The other options work differently: those that kill on contact require the pest to touch the chemical, not eat it; protectants form a barrier or stay on surfaces to deter or protect the treated area, rather than rely on ingestion; and sterilants interfere with reproduction rather than causing immediate death from ingestion.

Pesticides that kill pests after they swallow them are stomach poisons. They’re formulated to be eaten, often as bait, and their toxic effects show up after digestion, leading to death. This ingestion route is the defining feature of stomach poisons, setting them apart from other types.

The other options work differently: those that kill on contact require the pest to touch the chemical, not eat it; protectants form a barrier or stay on surfaces to deter or protect the treated area, rather than rely on ingestion; and sterilants interfere with reproduction rather than causing immediate death from ingestion.