21. Which soil covers a vast area of the Indus plain, including most of Punjab, Peshawar, Mardan, Bannu, and Kachhi plains?
(a) Bangar Soil
(b) Khaddar soil
(c) Indus Delta Soil
(d) Mountain soil
22. Indus plain is subdivided into how many parts?
(a) Two
(b) Three
(c) Four
(d) Five