Question

Dark-lava soils are seen in which district(s) of Rajasthan?
(A) Bhilwara
(B) Udaipur
(C) Chittorgarh
(D) All of these

Answer 1

Hint: Chernozem is a black- tinted soil comprising a high percentage of humus and high percentages of phosphoric acids, phosphorus, and ammonia. Chernozem is very productive and can yield high agricultural harvests with its high wetness stowage volume. Chernozems are similarly a Reference Soil Group of the World Reference Base for Soil Resources (WRB).

Complete answer:
Dark-lava soils or black soils are also referred to as regur soils. These soils are mostly located in Central India and the Deccan Highland. The soil is appropriate for cultivating cotton. It is supposed that the climatic settings along with the parent rock material are the significant aspects for the creation of black soil. This kind of soil is usually of the Deccan trap area spread over Northwest Deccan highland and is created from lava flows. They overlay the highlands of Maharashtra, Saurashtra, Malwa, Madhya Pradesh, Chhattisgarh and spread in South-East direction laterally Godavari and Krishna gorges. These soils comprise vital clay minerals as montmorillonite. These soils envelop a wide-ranging area of 3,00,000 sq. km. The production assets of the above-mentioned soils are as follows: (i) High sponginess, (ii) Low comportment capacity, and (iii) Low clipping strength.

Thus, option (D) is correct.

Note: The term is said to have originated from the Russian rapports for black and soil, earth or land (\[{\text{chorny }} + {\text{ Zemlya}}\]). The soil, opulent in carbon-based material offering a black colour, was originally recognized by Russian geologist Vasily Dokuchaev in 1883 in the tallgrass grassland or plain of European Russia.