Age of Earth is_____________________?
A. 4.5 billion years
B. 4 billion years
C. 1 billion years
D. 6 billion years
Soil Science
Problem of erosion in Thal and Cholistan is due to____________________?
Problem of erosion in Thal and Cholistan is due to____________________?
A. Wind
B. Fire
C. Water
D. Atmosphere
Elements essentially required for growth of all plants species are___________________?
Elements essentially required for growth of all plants species are___________________?
A. 32
B. 15
C. 16
D. 3
Histols are found in______________________?
Histols are found in______________________?
A. Pakistan
B. Canada
C. Alaska
D. Both b & c
Mineral soil contain organic carbon___________________?
Mineral soil contain organic carbon___________________?
A. >4%
B. 5%
C. <20%
D. >10%
The chemical formula of urea fertilizer is_______________________?
The chemical formula of urea fertilizer is_______________________?
A. NH2CONH2
B. [CO(NH2)]
C. Both a & b
D. None of the above
International atomic weight of potassium is_________________?
International atomic weight of potassium is_________________?
A. 39.0
B. 40.0
C. 41.0
D. 38.0
The available form of calcium to plant is________________?
The available form of calcium to plant is________________?
A. Ca(free cation
B. CaO
C. Ca
D. None of the above
The molar mass of NaCl is_____________________?
The molar mass of NaCl is_____________________?
A. 56.58
B. 43.28
C. 50.58
D. 58.58
The available from of nitrogen for plant is________________?
The available from of nitrogen for plant is________________?
A. NO3
B. NH4
C. Both a & b
D. None of the above