156. 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
      

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

---

157. 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
      

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

---

---

158. 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

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

---

159. Consider the following statements
     1. The granite and gneisses give rise to red soil through weathering
     2. The laterite soil contains the hydrated oxides of iron and aluminium
     3. Both the red and laterite soils are poor in nitrogen but rich in potash and phosphorus.
     Which of the statement (s) given above is / are correct ?

1. 1. 1 and 2 only

   
   
   

   2. 2 only

   
   
   

   3. 1 and 2 only

   
   
   

   4. 1, 2 and 3

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

---

---

160. 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
      

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

---