Soil Science

Producers need sunlight, carbon dioxide, and _______ for photosynthesis

• Glucose

• 
  Water

• 
  Oxygen

When water evaporates it is changing from:

• 
  gas to liquid

• 
  liquid to solid

• 
  liquid to gas

• 
  gas to solid

What is a controlled variable? 

• parts of the experiment that change

• parts of the experiment that stays the same 

If I give a plant fertilizer, then it will grow taller than the plant that was normal and got no fertilizer.  What part of the scientific method is this statement?

• Constant

• 
  Independent Variable

• 
  Dependent Variable

• Hypothesis

The condition of the plant has changed because I gave it fertilizer.  The other plant got no change (the control).

• Dependent Variable

• Independent Variable

• 
  Constant

• 
  Control

What percent of soil is air?

• 
  20-30

• 
  5

• 45

What percent of soil is organic matter?

• 
  20-30

• 
  5

• 
  45

What would be the best soil texture for growing crops, such as corn and vegetables?

• 
  Sandy clay

• 
  Sand

• 
  Loam

• Silty Loam

Which of the following is the best reason soil texture is important?

• it affects ability for soil to hold water

• 
  it affects ability for soil to hold nutrients

• it affects soils chance of erosion

• All of the above

It takes more farming area to feed a family of four people today than it did 100 years ago

• True

• False