Khadar soils are preferred over Bhangar soils for crop cultivation because
1. Khadar soil are composed of fine particles than that of Bhangar soil.
2. Bhangar soils lack in kankar nodules.
Choose the correct reason from the codes below.

Why black soils are treated with cement or hydrated lime during Roadways and railways construction? Consider the reasons
1. To overcome problems of volume changes due to alternate expansion and shrinkage of soils.
2. To prevent soil erosion during wet season.
3. To improve bearing capacity of the soil.
Choose the correct reason from the codes below.

Although laterite soils are formed in regions with high rainfall and high temperature, it requires good dosage of manures. What are the reasons?
1. Intense leaching because of high rainfall.
2. lack or less availability of humus.
Choose the correct code from the following

Left hand side is the region and right hand side is the major reason in that region for soil degradation.
1. Odisha, Jharkhand --- deforestation and mining.
2. Rajasthan, Maharashtra --- over irrigation.
3. Punjab, Haryana --- overgrazing.
Which are correctly matched?

Which one of the following is the appropriate reason to consider the Gondwana Rocks as most important of rock systems of India?

Consider the statements regarding red and yellow soils.
1. Soil looks yellowish when iron diffused in the soil gets hydrated.
2. Red and yellow soils are mainly found in the deltaic regions especially in the Eastern Indian coast.
3. Less fertile coarser soils are found in the uplands while fertile fine soils occur in the< low lying regions.
Which are the correct statements?

Consider the following statements regarding a particular soil
1. Found in the summits of Western Ghats, Eastern Ghats, Vindhyas, Sathpuras and Malwa plateau.
2. Subjected to intense leaching and thus not fit for agriculture unless manures and fertilizers are used.
3. It is the end product of weathering process and thus it is indefinitely durable.
Which is the soil that is spoken about in the above statements?

The soil salinization occurred due to irrigation is a concern in drier regions and not in humid regions. Consider the following statements
1. In humid regions, there is enough precipitation to leach (wash) the salts below the plant root zone.
2. In drier regions, higher temperature leads to higher evaporation of water resulting into leaving behind of salt on the surface of the soil.
3. Soil salinization occurring due to irrigation can equally impact both humid areas as well as drier areas.
Choose the correct statement from the code given below

Laterite soils and Forest soils are acidic in nature. What is the reason for this?

Rivers forms many outstanding features throughout their course. In this respect which of the following pairs are correctly matched ?
1. river capture : middle course
2. meanders : upper course
3. ox-bow lakes : lower course
Select the correct answer using the codes given below.