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Soil Science Quiz 2

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Soil Science Quiz 2

1 / 50

The movement of water through a column of soil is called:___________?

2 / 50

Which bacteria causes fermentation__________________?

3 / 50

The factor used for conversion of P to P2O3 is________?

4 / 50

Which is passive factor of weathering ?

5 / 50

Most widely spread mineral in the world is________________?

6 / 50

Water-erosion can be reduced / controlled by:___________?

7 / 50

C12H12N-NaO8S2 is the chemical formula of ________?

8 / 50

Rocks and weathered materials transported by ___________ ,act as initial materials for soil formation?

9 / 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?

10 / 50

Mean annual precipitation for tundra region is ________?

11 / 50

The horizons O, A, E and B (other than r and C) are collectively called_____________?

12 / 50

In Pakistan, The following igneous rocks are found over considerable areas:

13 / 50

Inceptisols:___________?

14 / 50

Na2CO3 salts is___________________?

15 / 50

Roots usually occupy :__________?

16 / 50

Nitrogen gases are involved in_________?

17 / 50

Widely spread saprophytic fungi is____________?

18 / 50

Histols are found in__________?

19 / 50

While diluting acid always add_________?

20 / 50

Element responsible pollen grain of plant__________?

21 / 50

The first mechanism to start in the wind erosion is_________?

22 / 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:

23 / 50

The availability of essential nutrients from soil to the plants is controlled by the ________ properties of soil:

24 / 50

Process of mixing of soils is known as_________?

25 / 50

Rocks which are formed by disintegration of pre-existing rocks by weathering are________?

26 / 50

Point of zero change means________?

27 / 50

Organisms satisfying their carbon requirement as Co2 from atmosphere and energy requirement from oxidation of simple inorganic compound are called as_________?

28 / 50

___________ , considered a perfect soil, is a mixture of silt, clay and sand:

29 / 50

The process of accumulation of excess quantity of nutrients in water causing O2 deficiency is known as_________?

30 / 50

The chemical formula for Ammonium acctatc is_________?

31 / 50

Slipperiness is due to__________________?

32 / 50

Which of the following crop takes N in ammonical form:

33 / 50

The planned development, distribution and use water resources:

34 / 50

Extraction of humic substance can be done by__________?

35 / 50

Salt-tolerant plants are called ________?

36 / 50

Soil is a variable mixture of Major components:

37 / 50

What is the formula of urea?

38 / 50

Sustainable Technologies to Control Water-Logging:

39 / 50

Available water is held between?

40 / 50

Soil pores created by the animal such as earthworm and plant root are called_________?

41 / 50

The reaction of Na2 CO3 salt is________?

42 / 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:_________?

43 / 50

Erosion permitting and erosion resisting crops grow alternatively at right angle to the slope of the land is called as:_________?

44 / 50

Primary air pollution is________?

45 / 50

Pneumatic potential is due to________?

46 / 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:

47 / 50

1 meq of HCl is equal to_________?

48 / 50

Acid soils of the world?s arable comprise up to_________?

49 / 50

What is the optimum temperature and pH for nitrifying bacteria ?

50 / 50

Nitrosomonas and nitrobacter are together as called_____________?

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