Which is the main cause of desertification?

Related Mcqs:

1. 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

2. Pakistan being predominantly an arid and semiarid country, In addition to agricultural productivity losses and increasing poverty, desertification results in significant reductions in _________?

   A. Contributing to global warming
   B. Carbon storage in soils
   C. loss of biodiversity
   D. All of these

   Submitted by: Shafiq Rehman

3. Main product of photosynthesis is_____________________?

   A. C6H12O6
   B. C12H24O12
   C. C3H6O6
   D. C5H12O6

4. Igneous rock whose crystal is 1 cm called____________________?

   A. Plutonic
   B. Felsic
   C. Pegmatitic
   D. Mafic

5. Age of Earth is_____________________?

   A. 4.5 billion years
   B. 4 billion years
   C. 1 billion years
   D. 6 billion years

6. pH in coniferous forest is__________________?

   A. Less than 7
   B. Neutral
   C. Greater than 7
   D. Basis

7. The albedo of the earth is:__________?

   A. 10%
   B. 20%
   C. 30%
   D. 35%

   Submitted by: Shafiq Rehman

8. Organic matter influences:_________?

   A. Water holding capacity
   B. Cation exchange capacity
   C. Aggregate stability
   D. All of the above

   Submitted by: Shafiq Rehman

9. ‘A’ horizon of the soil is also designated:

   A. Eluvistal horizon
   B. Illuviated horizon
   C. Alluvial horizon
   D. None of the above.

   Submitted by: Shafiq Rehman

10. Who will decompose organic matter first:

    A. Actinomycetes
    B. Bacteria
    C. Basidiomycetes
    D. Fungi imperfecti

    Submitted by: Shafiq Rehman