Chromium (Cr) is a____________________?
A. Macro element
B. Secondary element
C. Heavy metal
D. Free element
Soil Science
The process of accumulation of excess quantity of nutrients in water causing O2 deficiency is known as_____________________?
The process of accumulation of excess quantity of nutrients in water causing O2 deficiency is known as_____________________?
A. Eutrophication
B. Nitrification
C. Denitrification
D. Sedimentation
Addition of sodium hexametaphosphate in soil for determination of soil texture causes__________________?
Addition of sodium hexametaphosphate in soil for determination of soil texture causes__________________?
A. Agregation of soil particles
B. Cementing of soil particles
C. Dispersion of soil particles
D. All the above
The problem of soil crosion Thal and Cholistan is predominantly due to___________________?
The problem of soil crosion Thal and Cholistan is predominantly due to___________________?
A. Wind
B. Air
C. Water
D. All the above
Na and k can be determined by the use of____________________?
Na and k can be determined by the use of____________________?
A. Hydrometer
B. Flame photometer
C. Spectrophotometer
D. All the above
Gold is___________________?
Gold is___________________?
A. Native element
B. Secondary element
C. Primary element
D. Heavy metal
Salt-tolerant plants are called ____________________?
Salt-tolerant plants are called ____________________?
A. Glycophytes
B. Halophytes
C. Xerophytes
D. All the above
Total salt affected soils of Pakistan are____________________?
Total salt affected soils of Pakistan are____________________?
A. 6.3 m ha
B. 5.0 m ha
C. 12.3 m ha
D. 10.5 m ha
Cyclic salts are mostly of ______________________?
Cyclic salts are mostly of ______________________?
A. SO4
B. HCO3
C. Cl–
D. None of the above
Corrositivity of water is an indication of___________________?
Corrositivity of water is an indication of___________________?
A. Salinity
B. Property of polluted material
C. Both a & b
D. None of the above