Allied & ICAR Exam Bank • ALLIED_0499 MCQ • 1 Mark

Section 5: Irrigation and Drainage Engineering

Soil-Water-Plant Relationship

Subtopic: Soil-Water-Plant Relationship

Question Statement:

In saline soils, plant roots experience physiological drought primarily due to:

Options:

  • (A) High osmotic potential in the soil solution reducing the total soil water potential gradient
  • (B) Physical lack of liquid water in the soil pores
  • (C) Complete absence of soil air
  • (D) Excess soil nitrogen

Answer Key:

A

Step-by-Step Solution & Explanation

High solute concentrations lower the osmotic potential ($\\psi_s$), making total water potential $(\\psi_t = \\psi_m + \\psi_s)$ more negative than root sap potential.
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