Soil-forming minerals occurring in rocks do not contain any water, they undergo ______________ when exposed to humid conditions & break down as in chemical weathering process:

Related Mcqs:

1. Weathering process-physical, chemical, and biological _______________, the rocks and minerals into simpler products which either accumulate in place or are transported to other places where they become soil parent materials?

   A. Disintegrate
   B. Disentigrate
   C. Decompose
   D. Both a & c

   Submitted by: Shafiq Rehman

2. According to a latest research, Pakistan is predominantly a dryland country; 80% of its land area is arid and semi arid, 12% sub-humid and 8% under humid climate. Thus , soils of arid & semi-arid regions are vulnerable to a wide range of degradation process. As the case in arid and semi-arid climates elsewhere in south-central/southern Asia and Sub-Saharan Africa; _________________ are among the major causes of soil degradation and desertification?

   A. Drought stress
   B. Accelerated erosion & salinization
   C. Depletion of soil fertility and SOM
   D. All of the above

   Submitted by: Shafiq Rehman

3. Most common rocks, after exposed to weathering which cover about ______% 0f the earth:

   A. metamorphic rocks
   B. Sedimentary rocks
   C. Igneous rocks
   D. Shales

   Submitted by: Shafiq Rehman

4. Rocks which are formed by disintegration of pre-existing rocks by weathering are____________________?

   A. Sand stone
   B. Classics
   C. Igneous
   D. Greis

5. ______________ consist of particles that are produced by disintegration of pre-existing rocks through the process of weathering:

   A. Clastics
   B. Non-clastics
   C. both A & B
   D. None of the above

   Submitted by: Shafiq Rehman

6. 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

7. _______________ of alluvium (stratified sediment) by earth-worms is the most important soil-forming process in the alluvial plain of Pakistan:

   A. Homogenization
   B. Pedoturbation
   C. Lessivage
   D. Melanization

   Submitted by: Shafiq Rehman

8. 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

9. 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

10. Nitrogen & sulphur dioxide liberate from motor vehicles & industries. Nitrogen & Sulphur gases dissolve in the water vapour of atmosphere & form nitric & sulphuric acid. This rain water falls on soil as__________ & contaminates soil also:

    A. Acid rain
    B. Neutral rain
    C. Both A & B
    D. None of the above

    Submitted by: Shafiq Rehman