Q. Consider the following:

1. Oxisols dominate tropical rainforests and are rich in nutrients
2. Histosols function as a huge carbon sink in the world
3. Solonchaks are saline soils found in arid and semi-arid areas
4. Chernozems are extremely fertile and rare soils

Which of the above statements is / are correct?
Answer: All are correct statements
Notes: Oxisols are prominent in tropical rainforests but are nutrient-poor due to heavy leaching. Histosols, rich in organic matter, store significant carbon. Solonchaks are saline soils typically present in arid regions. Chernozems are indeed rare and very fertile. Thus, all four statements given are correct regarding their characteristics and global distribution.