Agriscience Unit 7

Crops suffer from air pollution.

• True

• False

EDU (the acronym for the growth hormone Ethylenediurea) can reduce damage to trees suffering from too much water.

• True

• False

Crops are lost due to air pollution.

• True

• False

Gas engines cause chlorofluorocarbons to be emitted into the atmosphere.

• True

• False

Radon is a welcomed gas in homes and barns.

• True

• False

Which process uses chlorophyll to change carbon dioxide and water to sugar?

• respiration

• photoperiodism

• phototropism

• photosynthesis

_____ is the area or type of environment in which an organism or biological population lives.

• Air quality

• Habitat

• Atmosphere

• Land mass

What percentage of the air is oxygen?

• 21 percent

• 77 percent

• 54 percent

• 42 percent

Identify the pale yellow element occurring widely in nature.

• iron

• phosphorous

• sulfur

• antimony

Which is a colorless, radioactive gas formed by the disintegration of radium?

• radon

• carbon monoxide

• nitrous oxide

• chlorofluorocarbon