Multiple choice Which of the following regions uses 'tankas' to collect and store rainwater? Bengal Karnataka Rajasthan Himachal Pradesh Meghalaya Reveal answer Fill a bubble to check yourself C Correct answer Explanation This is the correct answer. In the semi-arid and arid regions of Rajasthan, particularly in Bikaner, Phalodi and Barmer, almost all the houses traditionally had underground tanks or tankas for storing drinking water.