Prelims

The black cotton soil of India has been formed due to the weathering of

Consider the following statements:

1. Agricultural soils release nitrogen oxides into environment.
2. Cattle release ammonia into environment.
3. Poultry industry releases reactive nitrogen compounds into environment.

Which of the statements given above is/are correct?

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 ?

In India, the problem of soil erosion is associated with which of the following?
1. Terrace cultivation
2. Deforestation
3. Tropical climate
Select the correct answer using the code given below:

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.

Contour bunding is a method of soil conservation used in

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