Question

Salinity of the soil is often caused due to

• A. Accumulation of soluble minerals near or in the surface in arid region
• B. Excessive addition of water
• C. Rapid evaporation of surface water
• D. Excessive leaching

Answer 1

Answer: (A)

Accumulation of soluble minerals near or in the surface in arid region

Soil salinity is the presence of excess salts especially those of sodium, potassium and magnesium.

Soil salinity is caused by-

(i) Soil formation from rocks having excess of sodium, calcium, magnesium etc.

(ii) Nearness to sea shore, salt lake or salt mine.

(iii) Irrigation with water rich in basic salts.

(iv) Absence of slope or presence of basin-shaped topography.

(v) Elevated water table with aridity.

When minerals accumulate near surface of arid regions, soil becomes saline

So, the correct answer is 'Accumulation of soluble minerals near or in the surface in arid region'