Soil Colloid

What is the primary constituent of soil colloids?

• Minerals
• Water
• Organic matter
• Air

Which type of soil colloids have a net negative charge?

• Iron and aluminum oxides
• Silica colloids
• Aluminum silicate clay minerals
• Humus colloids

What is the role of soil colloids in nutrient availability?

• They transport nutrients to plant roots
• They release nutrients into the soil solution
• They adsorb and retain nutrients
• They convert nutrients into a usable form

Which type of soil colloids are responsible for cation exchange?

• Silica colloids
• Humus colloids
• Iron and aluminum oxides
• Aluminum silicate clay minerals

What is the process by which soil colloids bind together to form larger aggregates?

• Hydration
• Flocculation
• Leaching
• Desorption

Which type of clay mineral has the highest cation exchange capacity?

• Illite
• Kaolinite
• Chlorite
• Montmorillonite

What is the primary factor that determines the specific surface area of soil colloids?

• Organic matter content
• Mineral composition
• Particle size
• Particle shape

Which type of soil colloids have the highest water-holding capacity?

• Iron and aluminum oxides
• Aluminum silicate clay minerals
• Silica colloids
• Humus colloids

What is the process by which soil colloids release adsorbed nutrients?

• Leaching
• Flocculation
• Adsorption
• Desorption

What is the term for the ability of soil colloids to attract and hold onto cations?

• Cation exchange capacity
• Buffering capacity
• Base saturation
• Anion exchange capacity