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?

Related Mcqs:

1. 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...

2. 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:

   A. Carbonation B. Acidification C. Hydration D. Dissolution Submitted by: Shafiq Rehman...

3. The major soil fertility problems in Pakistani soils deficiencies of N, P and Zn. Deficiencies K, Fe, and B also occur in specific crop genotypes or soil types, while deficiencies of S, Cu, and Mn are negligible. however, the common nutrient deficiencies are_________________: and some micronutrients including Mo?

   A. N, P, K B. Ca, Mg, S C. both A & B D. The above statement is wrong Submitted by: Shafiq Rehman...

4. Almost one third of the land area through out the world is affected by land degradation. Pakistan’s agriculture sector though facilitates employment to >65% but is facing challenges from:

   A. Erosion B. Salinity C. Waterlogging D. All of the above Submitted by: Shafiq-ur-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. Degradation of green colour of fruits is due to___________________?

   A. pH changes B. Oxidative system C. Chloroplry lases D. All the above...

7. 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...

8. 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...

9. Causes of Soil are:__________?

   A. Indiscriminate felling of trees B. Over grazing C. Mismanagement of irrigation syste D. All of these Submitted by: Shafiq Rehman...

10. Pedogenic processes bring about changes in the parent materials in the form of _____________________, within the soil body (soil profile)?

    A. Additions, losses B. Transfers and transformations C. both A and B D. None of the above Submitted by: Shafiq Rehman...