Soil Science Quiz 5
1 / 50
The internal & external surfaces of soil colloids are positively and or negatively charged. Mostly ____________ is dominant:
2 / 50
Rhizoplane is________?
3 / 50
Soil moisture and ET losses are_________________?
4 / 50
International day of forest is celebrated on___________?
5 / 50
Which of the following is wrong?
6 / 50
Auxins promote___________________?
7 / 50
What is the pH of calcareous soils?
8 / 50
Based on their diameters, soil pores are divided into:_________?
9 / 50
If the chlorophyll content in plant increases, the solar radiation transmitted:
10 / 50
In Pakistan, Indus plains are formed from ___________ parent material which was transported by Indus river and its tributaries from Himalayas?
11 / 50
Composition of igneous rock is determined by___________?
12 / 50
Shrinking and swelling is property of__________________?
13 / 50
What is Vesicular Arbuscular Mycorrhiza (VAM)?
14 / 50
The available soil is being polluted quickly by _____________ wastes.
15 / 50
Accumulation of Al and Fe oxides and clays coming from the upper profile layers:
16 / 50
Metamorphic rocks are formed from________?
17 / 50
Combination of soil genesis and classification is collectively called_________?
18 / 50
Water occupied the larger soil pores and moves down readily under the force of gravity. Water in excess of the field capacity is termed:
19 / 50
Association of two microorganisms in which one is benefited while other remains unaffected is known as:________?
20 / 50
Which of the following are secondary minerals:
21 / 50
Exposure of the manures to rains causes highest loss of___________?
22 / 50
The EC: SAR and RSC values suggested by WAPDA for 3rd class irrigation water(C,S,R,) are________?
23 / 50
Which instrument is used for determining soil texture___________________?
24 / 50
The inner shell of earth consists of_________?
25 / 50
Nutritive elements needed in large quantities to ensure normal plant development:
26 / 50
Accumulation of soluble salts in soil________?
27 / 50
Each layer of phyllosilicates is composed of two types of sheets:
28 / 50
Pakistan being predominantly an arid and semiarid country, In addition to agricultural productivity losses and increasing poverty, desertification results in significant reductions in _________?
29 / 50
Surface removal of ice or snow from a glacier or snowfield by melting, sublimation, and/ or calving:
30 / 50
Sulphur is an essential component of:__________?
31 / 50
Soils that have more than 20% organic matter are termed as:__________?
32 / 50
The plant in which CO2 fixation is solely via the Calvin cycle is_________?
33 / 50
Which compound decay slowly__________?
34 / 50
Thickness of Dikes ranges from___________________?
35 / 50
The instrument used for measuring the photosynthetically active radiations (PAR) is:________?
36 / 50
Which of the following is a component of nucleic acid and protein:
37 / 50
Select the water soluble phosphatic fertilizer from the following__________?
38 / 50
Clay and humus particles are referred to as colloids and are less than 0.002mm. Due to their small size, colloids have ________________ surface area which provides surface for adsorption, catalysis, precipitation and microbial colonization:
39 / 50
Silt stones consists of grains whose size range from________?
40 / 50
Mechanisms of material uptake by plants is by________?
41 / 50
Deep percolation from a soil profile is generally measured by a device known as_________?
42 / 50
According to FCO, the maximum permissible total N content in the form of urea in DAP should be:_________?
43 / 50
Large pieces of erupted magma are called_________?
44 / 50
Decomposition of the organic matter in submerged soil is carried out by?
45 / 50
The appropriate method to apply phosphatic fertilizers is__________?
46 / 50
The deficient macronutrient in the sodic soils is:_______?
47 / 50
Silica tetrahedron is__________?
48 / 50
Which of the following is not a metamorphic rock?
49 / 50
Formula used for the calculation of sodium absorption ratio is__________?
50 / 50
In cotton, zn deficiency is known as_________?
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