Soil Science Quiz 2
1 / 50
The first mechanism to start in the wind erosion is_________?
2 / 50
Point of zero change means________?
3 / 50
Which is passive factor of weathering ?
4 / 50
Organisms satisfying their carbon requirement as Co2 from atmosphere and energy requirement from oxidation of simple inorganic compound are called as_________?
5 / 50
The planned development, distribution and use water resources:
6 / 50
Widely spread saprophytic fungi is____________?
7 / 50
Which of the following crop takes N in ammonical form:
8 / 50
Erosion permitting and erosion resisting crops grow alternatively at right angle to the slope of the land is called as:_________?
9 / 50
C12H12N-NaO8S2 is the chemical formula of ________?
10 / 50
The availability of essential nutrients from soil to the plants is controlled by the ________ properties of soil:
11 / 50
Acid soils of the world?s arable comprise up to_________?
12 / 50
Rocks and weathered materials transported by ___________ ,act as initial materials for soil formation?
13 / 50
Sustainable Technologies to Control Water-Logging:
14 / 50
Soil is a variable mixture of Major components:
15 / 50
Which bacteria causes fermentation__________________?
16 / 50
In Pakistan, The following igneous rocks are found over considerable areas:
17 / 50
What is the effect of application of P2O5 fertilizer to a green manure leguminous crop in the availability of phosphorus to the succeeding crop?
18 / 50
Soil pores created by the animal such as earthworm and plant root are called_________?
19 / 50
Water-erosion can be reduced / controlled by:___________?
20 / 50
Na2CO3 salts is___________________?
21 / 50
___________ , considered a perfect soil, is a mixture of silt, clay and sand:
22 / 50
Roots usually occupy :__________?
23 / 50
Inceptisols:___________?
24 / 50
What is the optimum temperature and pH for nitrifying bacteria ?
25 / 50
Extraction of humic substance can be done by__________?
26 / 50
The chemical formula for Ammonium acctatc is_________?
27 / 50
The movement of water through a column of soil is called:___________?
28 / 50
Pneumatic potential is due to________?
29 / 50
The factor used for conversion of P to P2O3 is________?
30 / 50
Nitrosomonas and nitrobacter are together as called_____________?
31 / 50
Slipperiness is due to__________________?
32 / 50
What is the formula of urea?
33 / 50
Histols are found in__________?
34 / 50
The reaction of Na2 CO3 salt is________?
35 / 50
Most widely spread mineral in the world is________________?
36 / 50
The process of accumulation of excess quantity of nutrients in water causing O2 deficiency is known as_________?
37 / 50
Previously Essential nutrients required for the growth of plants were sixteen. In recent time the essential nutrients required for the growth of plants are:_________?
38 / 50
Small rivulets or finger like channels formed on the surface of earth by action of water, these channels are of small depth & can be leveled by tillage operations is:
39 / 50
Element responsible pollen grain of plant__________?
40 / 50
Process of mixing of soils is known as_________?
41 / 50
The horizons O, A, E and B (other than r and C) are collectively called_____________?
42 / 50
Nitrogen gases are involved in_________?
43 / 50
1 meq of HCl is equal to_________?
44 / 50
Mean annual precipitation for tundra region is ________?
45 / 50
In Pakistan there is general deficiency of rainfall. It varies from 125 mm annually in upper Sindh to about 900 mm in the sub-mountainous of northern Pakistan. In Balochistan the mean annual rainfall is about 200 mm, diminishing to ________ mm in the desert of Kharan:
46 / 50
Primary air pollution is________?
47 / 50
While diluting acid always add_________?
48 / 50
Rocks which are formed by disintegration of pre-existing rocks by weathering are________?
49 / 50
Available water is held between?
50 / 50
Salt-tolerant plants are called ________?
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