Unit 4 Quick Review

___________________ refers to the amount of and duration of light emitted by a light source

• Light Quality

• Light Quantity

____________________ is the response of plant growth based upon the number of hours of light received each day.

• Photoperiodism

• Phototropism

__________________ were developed by the USDA and are zones based upon average annual minimum winter temperatures.

• Soil Zones

• Hardiness Zones

Soil consists of four main components... what are they?

• water

• air

• minerals

• organic matter

• all of the above

Hard bedrock is which soil horizon?

• Horizon O

• Horizon A

• Horizon R

• Horizon C

Soil pH is neutral at what number?

• 3

• 5

• 7

• 10

Which of the following are macronutrients?

• carbon

• hydrogen

• oxygen

• All of the above

True or False: soluble fertilizer is dissolved in water and are applied to plants in a liquid solution.

• True

• False