A. Depth of molten magma
B. Composition of molten magma
C. Both A and B
D. Composition can not be determined.
Soil Science
Rhizoplane is……..?
A. An area of soil from root surface to 5 cm
B. Root surface
C. Area within the roots
D. All of them
Which of the following is a component of nucleic acid and protein:
A. Ca
B. Mg
C. N
D. None of the above
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
Soil Organic Matter (SOM) serves not only as a reservoir of all the required plant nutrients, but it:
A. Provides energy for the microbial
B. Maintains the productivity of soil
C. Gives structure to the soil
D. All of these
In Pakistan, the major phosphatic fertilizers are:
A. DAP
B. SSP
C. Nitrophos
D. All of Above
All the SSP and some nitrophos are are manufactured locally by the National Fertilizer Corporation (NFC): SSP at………?
A. Faisalabad
B. Jaranwala
C. Haripur
D. All of these
In Pakistan, Nitrophos is manufactured in………?
A. Multan
B. Sawat
C. Lasbella
D. Shikarpoor
Potassium (K) occurs as a constituent of the earth’s crust in the proportion of………?
A. 23 %
B. 2.3 %
C. 17 %
D. 1.7 %
Oxygen and Silicon together comprise approximately …… %of the earth crust?
A. 64 %
B. 79 %
C. 75 %
D. 73 %