Explanation
- A
Black soil is locally called regur.
(a) Black soil is locally called regur. That is a true statement: Deccan black cotton soil is regur. It is not the incorrect line.
- B
According to Krabs, regur soil is essentially a mature soil.
(b) According to Krabs, regur soil is essentially a mature soil. The paper treats this citation as correct, so it is not the ‘NOT correct’ key.
- C
Black soils are highly retentive of moisture.
(c) Black soils are highly retentive of moisture. High moisture retention and self-ploughing swell-shrink are classic regur traits. The statement is correct.
- D
Black soil is found in the Himalayan region.
(d) Black soil is found in the Himalayan region. Black cotton soil belongs to the Deccan lava country (Maharashtra, Madhya Pradesh, Gujarat, Andhra, Tamil Nadu pockets), not the Himalaya. That false siting is the official key.
Summary. Official key is (d) Black soil is found in the Himalayan region. The question wants the untrue statement: Himalayan soils are not regur. Local name regur, maturity per Krabs, and moisture retention stay true. Neighbouring parent rock is Deccan Trap basalt. Honour the Himalayan mismatch.