IRS Has Proven Especially Helpful in Malaria Control Programs

question 10

Multiple Choice

IRS has proven especially helpful in malaria control programs. What does IRS stand for?

• A) Internal Revenue Service
• B) Insecticide Residual Spraying
• C) Institutional Residual Spraying
• D) Inside Residual Spraying
• E) None of these is correct.

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Definitions:

Uncompacted Clay

Clay that has not been compressed, retaining a high water content and low strength.

Unsaturated Zone

The layer of ground above the water table where soil and rock particles are not fully saturated with water.

Saturated Zone

The layer of an aquifer in which all the pores and rock fractures are filled with water.

Water Table

The level below which the ground is saturated with water.