Clay and humus particles are referred to as colloids and are less than 0.002mm. Due to their small size, colloids have ________________ surface area which provides surface for adsorption, catalysis, precipitation and microbial colonization:

Related Mcqs:

1. The clay fraction of the soil contains particles less than 0.002 mm. Particles <0.001 mm size:

   A. Soil Silt
   B. Soil colloids
   C. Soil loam
   D. Soil sand

   Submitted by: Shafiq Rehman

2. An intrazonal group of dark calcareous soils high in clay and having mainly montmorillonitic type clay are called as:________?

   A. Regur
   B. Ragour
   C. Montmorillosol
   D. Regosol

   Submitted by: Shafiq Rehman

3. Inorganic constituents vary in size from fine clay particles _________ mm to large _________ mm gravel and rock:

   A. < 0.002 mm- >2 mm
   B. 0.5 mm – 1.0 mm
   C. 0.02 mm- 0.2 mm
   D. None of the above

   Submitted by: Shafiq Rehman

4. The internal & external surfaces of soil colloids are positively and or negatively charged. Mostly ____________ is dominant:

   A. Positive
   B. Negative
   C. Zero
   D. All of the above

   Submitted by: Shafiq Rehman

5. How many type of soil colloids?

   A. 4
   B. 2
   C. 6
   D. 5

   Submitted by: Sherjan Nazir

6. Nitrification is the microbial conversion of____________________?

   A. NH nitrogen the NO3 nitrogen in soil
   B. NO2 to NO3 nitrogen in soil
   C. NO3 nitrogen to NH4 + in soil
   D. None of the above

7. The process of transformation of raw organic matter into humus:

   A. Calcification
   B. Horizonation
   C. Illuviation
   D. Humification

   Submitted by: Shafiq Rehman

8. Humus generally refers to the decomposed organic residues which have undergone a series of degradation and synthesis cycles. The humic substances consist of a series of highly acidic, yellow to black coloured, high molecular weight compounds __________________, which can be separated using different extraction procedures:

   A. Hymatomelanic  acid & Humin
   B. Humic acid & Fulvic acid
   C. both A & B
   D. None of these

   Submitted by: Shafiq Rehman

9. swelling clay soils, develop cracks due to greater proportion of swelling type clays:

   A. Alfisols
   B. Ultisols
   C. Vertisols
   D. None of the above

   Submitted by: Shafiq Rehman

10. Mean annual precipitation for tundra region is ____________________?

    A. 70-80 cm
    B. 150-70 cm
    C. 0-50 cm
    D. None of the above