Unit 9 Soils and Hydroponics

An example of plant-growing media is

• soil

• perlite

• water

• all of the above

Which is NOT organic matter?

• leaf mold

• peat moss

• sphagnum moss

• vermiculite

Decay of organic matter is caused by

• large animals

• microbes

• rodents

• water

Which is NOT a factor affecting soil formation?

• hydroponics

• gravity

• ice

• water

Humans affect soil formation by

• landscaping

• irrigating

• bulldozing

• weathering

The land class with the fewest limitations is

• Class I

• Class III

• Class VI

• Class VIII

The land classes suitable for field crop production are

• I, II, IV and VI

• I, II, III and IV

• I, IV, V and VIII

• I, II, VI and VII

The horizon that is most supportive of plant growth is

• horizon O

• horizon A

• horizon B

• horizon C

The smallest soil particle is

• clay

• gravel

• sand

• silt

A term related to soil structure is

• aggregate

• loam

• silt

• topsoil