Black cotton soil is commonly represented in the order of

Correct option is B

The correct answer is (B) Vertisols

Explanation:
• Black Cotton Soils (also known as Regur soils in India) are primarily classified under the soil order Vertisols.
• The defining characteristic of Vertisols is a high content of expanding-type clay minerals (like Montmorillonite).
• These soils undergo significant volume changes with moisture: they shrink and form deep, wide cracks during the dry season and swell when wet. This process is called "pedoturbation" or self-plowing.
• In India, they are widespread in the Deccan Plateau (Maharashtra, Madhya Pradesh, Gujarat) and are called Black Cotton soils because they are ideal for cotton cultivation.

Information Booster:
• Vertisols are characterized by "Slickensides" (polished, grooved surfaces) and "Gilgai" micro-relief.
• They have high cation exchange capacity (CEC) and are naturally fertile but difficult to manage due to their sticky/plastic nature when wet and hardness when dry.
• India has the second-largest area of Vertisols in the world after Australia.

Additional Knowledge:
• Alfisols (Option A): Moderately weathered soils with a clay-enriched sub-surface horizon; common in South India.
• Entisols (Option C): Very young soils with little to no horizon development; common in floodplains (Alluvial soils).
• Aridisols (Option D): Soils of arid regions (desert soils), often containing accumulations of salts or carbonates.