Statement I : Variability of annual rain fall is very high in western pan of Rajasthan. Statement I : Average annual rainfall is extremely low in western Rajasthan.

Statement I is true as western Rajasthan exhibits high rainfall variability, with the coefficient of variation reaching as high as 60-70% . Statement II is also true, as the region is characterized by extremely low average annual rainfall, often less than 200 mm in arid districts like Jaisalmer [5]. There is a well-established inverse relationship between the amount of average annual rainfall and its variability; regions with low rainfall typically experience higher variability [2]. In India, areas receiving less than 60 cm of annual rain, such as western Rajasthan, are identified as chronic drought-prone zones due to this high variability [3]. Therefore, the low average rainfall in western Rajasthan directly explains why its rainfall variability is so high, making Statement II the correct explanation for Statement I.

Sources

1. [5] https://krishikosh.egranth.ac.in/server/api/core/bitstreams/7bd9f5b0-06e8-4ba9-bb04-a61a5f4a7572/content
2. [1] Geography of India ,Majid Husain, (McGrawHill 9th ed.) > Chapter 4: Climate of India > VARIABILITY OF RAINFALL > p. 31
3. [2] CONTEMPORARY INDIA-I ,Geography, Class IX . NCERT(Revised ed 2025) > Chapter 4: Climate > DISTRIBUTION OF RAINFALL > p. 32
4. [3] Geography of India ,Majid Husain, (McGrawHill 9th ed.) > Chapter 4: Climate of India > DROUGHTS > p. 42