Match List-1 with List-11 and select the correct answer using the code given below the lists: List-I (soil type) I. OxisOLS II. Vertisols III. Histosols IV. Entisols List-11 (Major Chanrdelistiral 1 Very rids in organic matter2 2 Soil lacking horizons 3 Very old and highly weathe- red 4 Rich in day content and highly basic Code: I II III IV

The classification of soil orders is based on their physical and chemical properties. Oxisols (I) are highly weathered tropical soils, often considered very old with low natural fertility [1]. Vertisols (II) are characterized by high clay content and a high shrink-swell potential, often forming deep cracks when dry; they are typically rich in bases [3]. Histosols (III) are organic soils, such as peat and muck, which are very rich in organic matter due to accumulation in wetland environments [2]. Entisols (IV) are the least developed soils, characterized by a lack of diagnostic horizons because they are either very young or formed on resistant parent material [3]. Matching these characteristics leads to the sequence: I-3, II-4, III-1, IV-2, which corresponds to option 2.

Sources

1. [1] https://www.nrcs.usda.gov/sites/default/files/2022-06/Illustrated_Guide_to_Soil_Taxonomy.pdf
2. [3] https://www.sciencedirect.com/topics/agricultural-and-biological-sciences/entisol
3. [2] https://openknowledge.fao.org/server/api/core/bitstreams/03d6d88c-abd9-4dea-b8f9-8376e38d70f8/content