Soil Science Quiz for IBPS SO Mains, FREE PDF & Live Quiz

1. Which group of soil organisms proliferates when the soil is rich in organic substrate?

2. Loam soil is best described as a textural class in which:

3. Phosphate-solubilising bacteria (PSB) increase the availability of which nutrient?

4. Which culture, multiplied in the laboratory, is used to increase phosphorus availability in soil?

5. The most advanced stage of gully erosion, in which deep, wide channels remove large quantities of soil, is called:

6. Organic and inorganic soil colloids suspended in water generally carry a:

7. Which soil type contains a very high amount of organic matter and humus?

8. Micronutrients such as Fe, Mn, Zn, Cu and Mo function in plants mainly as:

9. ‘Akiochi’ disorder of rice in degraded paddy soils is caused by toxicity of:

10. Rock phosphate is most effective as a direct-application P fertilizer in:

11. Which plant is used as an indicator of boron deficiency?

12. The cheapest and most commonly used amendment for reclamation of sodic soils is:

13. Irrigation water contains Na⁺, Ca²⁺ and Mg²⁺ at 20, 10 and 8 me/L respectively. Its Sodium Adsorption Ratio (SAR) is:

14. The soil and water conservation measure most suited to steep hilly and mountainous slopes is:

15. The study of soil in relation to plant growth and crop production is called:

16. The largest and most important soil group of India by area is:

17. Black cotton soils of the Deccan Plateau, which shrink and swell with changes in moisture, belong to the soil order:

18. Laterite soils are reddish mainly because they are rich in:

19. The most highly weathered soil order, dominated by Fe and Al oxides, is:

20. The basic unit of soil classification is the: