1. Which soil system is most vulnerable to sodium-induced structural degradation?

 Sandy soil

 Clay-rich soil

 Loamy sand

 Gravel soil

2. Which factor most strongly reduces soil aggregate stability by causing clay dispersion and weakening inter-particle bonding?

 Organic matter

 Roots

 Sodium

 Calcium

3. Macropores are mainly formed by _______

 Clay dispersion

 Mineral weathering only

 Salt accumulation

 Root channels and soil fauna activity

4. Which pore class is primarily responsible for rapid water infiltration and drainage?

 Macropores

 Capillary pores

 Mesopores

 Micropores

5. Which soil condition most strongly promotes denitrification by creating low-oxygen environments?

 Dry soil

 Well-aerated soil

 Anaerobic soil

 Sandy soil

6. Which soil management practice is most likely to reduce macroporosity?

 Earthworm activity

 Root growth

 Organic matter addition

 Conventional tillage and compaction

7. Heat loss from soil is greatest under which surface condition?

 Organic matter

 Vegetation cover

 Bare soil

 Mulch

8. Which soil condition most effectively improves infiltration by enhancing macroporosity and pore connectivity?

 Sodicity

 Compaction

 Aggregation

 Crusting

9. Which factor most strongly increases pore tortuosity by distorting and fragmenting flow pathways within the soil matrix?

 Compaction

 Aggregation

 Biopores

 Organic matter

10. Which factor most effectively improves soil tilth by enhancing aggregation, friability, and workability?

 Compaction

 Organic matter

 Sodicity

 Drying

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