Agricultural Drainage Principles Practice Questions (Q1-1) - Water Science and Technology

Assertion (A) is True: The electrical conductivity of an irrigation water extract ($EC_w$) is directly proportional to its total dissolved solids ($TDS$), serving as the standard diagnostic parameter for salinity hazard ($TDS\text{ (mg/L)} \approx 640 \times EC_w\text{ (dS/m)}$).
Reason (R) is True: Dissolved inorganic salts dissociate into mobile cations and anions that carry electric current through the aqueous solution; higher ionic concentrations permit higher electric current conduction.
Relationship: Because dissolved salt ions are the charge carriers conducting electric current in water, Reason (R) directly explains Assertion (A).
Conclusion: Both (A) and (R) are true and (R) is the correct explanation of (A) (Option 1).

ICAR JRF Water Science And Technology 29 Jun 2024Shift 1

Assertion & Reason +4 −1

Given below are two statements, one is labelled as Assertion (A) and other one labelled as Reason (R).

Assertion : Effective irrigation management requires identifying critical stages of crop growth Reasoning: Critical stages of crop growth are those periods during which water stress can have a significant impact on crop yield

In light of the above statements, choose the correct answer from the options given below.

Both (A) and (R) are correct and (R) is the correct explanation of (A). Both (A) and (R) are correct but (R) is NOT the correct explanation of (A) (A) is correct but (R) is not correct. (A) is not correct but (R) is correct.