Agriscience Unit 8

A computer model for agriculture uses a database and computer programs to aid in management practices.

• True

• False

Computer models can actually identify the movement of pesticides in soils.

• True

• False

IThe USDA has outlawed the use of pesticides in areas where ground and surface water are available.

• True

• False

The USDA has identified only two states, Nevada and Utah, as having no risk to groundwater contamination by agricultural chemicals.

• True

• False

The USDA identifies nitrates and pesticides as potential groundwater contamination chemicals.

• True

• False

Identify the material that is left after a plant dies or is harvested.

• plant residue

• herbicide

• mulch

• skeleton

The bodies of young plants and animals consist of about 90 percent of which of the following?

• water

• blood

• muscle

• fat

Which of the following describes a universal solvent?

• cleans the materials

• is a toxic chemical

• dissolves or changes most other materials

• is a paint thinner

Which term describes drinking water that is free from harmful chemicals?

• sanitized

• potable

• fresh

• domestic

Soil is ____ when water fills all spaces or pores.

• porous

• free flowing

• irrigated

• saturated