The correct option is 1 and 4 because laterite soils, typically characterized by their reddish color due to high iron content, are prevalent in tropical regions and are primarily formed through intense weathering processes. These soils are not particularly rich in nitrogen and potash, which makes statement 2 incorrect. Furthermore, while they are not extensively developed in Rajasthan and Uttar Pradesh (making statement 3 incorrect), they support the growth of crops like tapioca and cashew nuts that thrive in well-drained, lateritic conditions, thus validating statement 4. This understanding is crucial for UPSC aspirants as it connects soil types with agricultural practices and regional geography.