Which one among the following statements with reference to the black cotton soils of India is NOT correct?

Which one of the following is an example of both an igneous as well as a metamorphic rock?

Which one of the following is found in appreciable amount in Laterite soil in India?

Soil, in which nearly all our food grows, is a living resource that takes years to form. Yet it can vanish in minutes. Each year 75 billion tonnes of fertile soil is lost to erosion. That is alarming — and not just for food producers. Soil can trap huge quantities of carbon dioxide in the form of organic carbon and prevent it from escaping into the atmosphere. 

 On the basis of the above passage, the following assumptions have been made : 

1. Large scale soil erosion is a major reason for widespread food insecurity in the world. 

2. Soil erosion is mainly anthropogenic. 

3. Sustainable management of soils helps in combating climate change. 

Which of the above assumptions is/are valid ?

With reference to agricultural soils, consider the following statements : 

1. A high content of organic matter in soil drastically reduces its water holding capacity. 

2. Soil does not play any role in the sulphur cycle. 

3. Irrigation over a period of time can contribute to the salinization of some agricultural lands. 

Which of the statements given above is/are correct ?

Which of the following statements regarding laterite soils of India are correct? 

1. They are generally red in colour. 

2. They are rich in nitrogen and potash. 

3. They are well-developed in Rajasthan and UP. 

4. Tapioca and cashew nuts grow well on these soils. 

Select the correct answer using the codes given below:

Which of the following adds/add nitrogen to the soil? 

1. Excretion of urea by animals 

2. Burning of coal by man 

3. Death of vegetation 

Select the correct answer using the codes given below: