Depositing larvacide in the stagnant water areas represents which control type?

• A. Mechanical.
• B. Biological.
• C. Cultural.
• D. Chemical.

Answer: (D)

The main idea here is identifying how a control method works. Depositing larvacide in stagnant water is chemical control because it uses a chemical substance applied to mosquito breeding sites to kill larvae and prevent development into adults. This differs from mechanical control, which would be physically removing water or barriers to prevent breeding; cultural control, which involves changing human practices or environmental management to reduce breeding sites; and biological control, which uses living organisms or their products to suppress the vector. So, applying a larvicide to water to kill larvae fits chemical control since the action relies on a chemical agent rather than physical removal, behavior change, or a living organism.