Specific heat is higher in:
Specific heat is higher in:
A. Clay
B. Humus
C. both A & B
D. Only Clay
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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?
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 aboveAge of Earth is_____________________?
Age of Earth is_____________________?A. 4.5 billion years
B. 4 billion years
C. 1 billion years
D. 6 billion yearsDecomposition of the organic matter in submerged soil is carried out by?
Decomposition of the organic matter in submerged soil is carried out by?A. Actinomycetes
B. Fungi
C. Algae
D. None of the aboveClay 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:
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 thesehydrosphere refers to______________________?
hydrosphere refers to______________________?A. Zone of water
B. Zone of air
C. Zone of atmosphere
D. Zone of earth crustThe soil quality is always deteriorated by:_________?
The soil quality is always deteriorated by:_________?A. Erosion & pollution
B. Waterlogging & salinization
C. Nutrient mining
D. All of these