Practice Test 3
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Consider the following statements, cation exchan of soil colloidal clay is due to

I. silicon tetrahedral layer
II. isomorphious substitution
III. hydration of clays
IV. broken edges of clay lattices Codes

Silica-sesquioxide ratio is useful in the evaluation of soil in respect of

In soil Taxonomy udolls is a suborder of

The concept of is suggested by the scientist

  • Solution

    pH Soil pH or soil reaction is an indication of the acidity or alkalinity of soil and is measured in pH is defined as the negative logarithm of the hydrogen ion concentration, The pH scale goes From 0 to 14 with pH 7 as the neutral point. From pH 7 to 0 the soil is increasingly more acidic and from pH 7 to 14 the soil is increasingly more alkaline or basic.

The occurrence of quartz in high amounts makes a rock

Deforestation has an alarming affect on

  • Solution

    Deforestation It has an alarming effect on soil erosion because bare land enhance the erosion.

The capacity of soil to be molded when wet i.e., to change shape in response to stress and to maintain that shape when the stress is removed is termed

Which one of the following minerals is the main source of boron in soils?

  • Solution

    Source of Boron Tourmaline is a major source of boron.

    => Pyrolusite is the source of Mn.
    => Olivine is the source of molybdenum (Mo)

The mineral chlorite has an extra layer of

A soil layer of maximum leaching is indicated by the symbol of

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