Soil Science - Study Mode

[#111] Instrument used to evaluate soil crust strength is
Correct Answer

(C) Penetrometer

Explanation

Solution: A penetrometer is an instrument used to evaluate soil crust strength. It is the device to test the strength of any material. It is equipped with a known needle and mass to determine the hardness. A penetrometer is also used to find the toughness of a leaf by measuring the force needed to punch a hole of a certain size through the leaf.

[#112] Permafrost is a layer where soil temperature is always
Correct Answer

(A) ≤ 0°C

Explanation

Solution: Permafrost is a layer where the soil temperature is always ≤ 0°C. It is defined as ground with a temperature that remains at or below freezing (0°C) for two or more consecutive years. It is a permanently frozen layer on or under the Earth’s surface. It consists of soil gravel and sand, usually bound together by ice.

[#113] It has been observed that soil pH increases in
Correct Answer

(C) Winter

Explanation

Solution: Soil pH is a measure of the acidity or basicity of soil. Soil pH is a key characteristic that can be used to make informative analysis both qualitative and quantitatively regarding soil characteristics. Soil pH is considered a master variable in the soils at affects many chemical processes. The optimum pH range for most plants is between 5.5 and 7.5. It has been observed that soil pH increases in Winter .

[#114] Saline soils comes under which soil group as Zonality concept?
Correct Answer

(C) Intrazonal

Explanation

Solution: Saline soils come under the Intrazonal soil group as a zonality concept. Intrazonal soils have more or less well-defined soil profile characteristics that reflect the dominant influence o some resident factor of relief or parent material over the classic zonal effects of climate and vegetation. Saline soil is one of the important intrazonal soil types, in saline soils, generally, no horizon differentiation and the whole profile looks more or less uniform.

[#115] Aspergillus niger test is used for
Correct Answer

(D) Cu and Mg

Explanation

Solution: Aspergillus niger is a haploid filamentous fungus that is used for waste management and biotransformation in addition to its industrial uses, such as the production of citric acid and extracellular enzymes. The use of Aspergillus niger as a test organism for determining Magnesium, copper and Molybdenum in soils.