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

Related Mcqs:

1. 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:

   A. Extremely low
   B. Extremely high
   C. Very little
   D. None of these

   Submitted by: Shafiq Rehman

2. How many type of soil colloids?

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

   Submitted by: Sherjan Nazir

3. Any material such as straw, sawdust, leaves, plastic films, & loose soil that is spread upon the surface of the soil to protect the soil & plant roots from the effects of raindrops, soil crusting, freezing or evaporation:

   A. Mull
   B. Mulch
   C. Mycorrhizae
   D. Muck

   Submitted by: Shafiq Rehman

4. Soil order characterized by excess of weathering with dominant iron and aluminium oxide clays, common in tropics is_________?

   A. Alfisols
   B. Mollisols
   C. Entisols
   D. Oxisols

   Submitted by: Shafiq Rehman

5. Soil additive which stabilizes the soil, improves resistance to erosion, increases to permeability to air & water, improves texture, eases cultivation or otherwise improves soil quality:

   A. Soil amendment
   B. Soil conditioner
   C. Both a & b
   D. None of the above

   Submitted by: Shafiq Rehman

6. Which type of structure is dominant in grasslands:

   A. Prismatic & Columnar
   B. Spheroidal or Sphere-like
   C. Angular blocky Sub-angular blocky
   D. Platy & Luminar

   Submitted by: Shafiq Rehman

7. The soil samples are dried at _______________, for gravimetric soil analysis?

   A. 110 ⁰C
   B. 120 ⁰C
   C. both A and B
   D. 105 ⁰C

   Submitted by: Shafiq Rehman

8. The availability of essential nutrients from soil to the plants is controlled by the ________ properties of soil:

   A. Physical
   B. chemical
   C. Biological
   D. both A & B

   Submitted by: Shafiq Rehman

9. __________________ systems play a crucial role in increasing soil organic C storage and reducing net emissions of greenhouse gases in addition to soil erosion control:

   A. Engineering
   B. Agroforestry 
   C. Cultivating
   D. All of the above

   Submitted by: Shafiq Rehman

10. Any tillage and planting system that maintains at least 30% of the soil surface covered by residue after planting for the purpose of reducing soil erosion by water:

    A. Deep Tillage
    B. Conservation Tillage
    C. Both a & b
    D. None of these

    Submitted by: Shafiq Rehman