1. Salinization occurs when the irrigation water accumulated in the soil evaporates, leaving behind salts and minerals. What are the effects of salinization on the irrigated land ?

1. 1. It greatly increases the crop production

   
   
   

   2. It makes some soils impermeable

   
   
   

   3. It raises the water table

   
   
   

   4. It fills the air spaces in the soil with water

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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2. Which one of following statements is not correct ?

1. 1. Highly weathered tropical and subtropical soils are called Oxisols

   
   
   

   2. Grassland soils rich in organic matter and high in bases are called Mollisols

   
   
   

   3. Soils in waterlogged areas with high organic matter are called Histosols

   
   
   

   4. Young soils with no horizons are called Inceptisols

   
   
   

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   NA

   Correct Option: D

   NA

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3. Assertion (A) : Laterite soils are red in colour and coarse in texture.
   Reason (R) : Laterite soils contain high concentrations of silica and calcium carbonate.

1. 1. Both (A) and (R) are individually true and (R) is the correct explanation of (A)
      

   
   
   

   2. Both (A) and (R) are individually true but (R) is not the correct explanation of (A)
      

   
   
   

   3. (A) is true but (R) is false
      

   
   
   

   4. (A) is false but (R) is true
      

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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4. Assertion (A) : Laterite soils are red in colour and coarse in texture.
   Reason (R) : Abundant phosphoric acid and silica give these soils, the particular colur and texture.
   Code

1. 1. Both (A) and (R) are individually true and (R) is the correct explanation of (A)
      

   
   
   

   2. Both (A) and (R) are individually true but (R) is not the correct explanation of (A)
      

   
   
   

   3. (A) is true but (R) is false
      

   
   
   

   4. (A) is false but (R) is true
      

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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5. Assertion (A) : The pH of acid rainless between 9 and 12.
   Reason (R) : Acid rain occurs due to heavy air pollution.
   Code

1. 1. Both (A) and (R) are true and (R) is the correct explanation of (A)
      

   
   
   

   2. Both (A) and (R) are true but (R) is not the correct explanation of (A)
      

   
   
   

   3. (A) is true but (R) is false
      

   
   
   

   4. (A) is false but (R) is true
      

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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