Question:
Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R
Assertion A: Infiltration rate is found to vary inversely with soil moisture content.
Reason R: With the increase in soil moisture content, the soil pores are filled with water.
In light of the above statements, choose the correct answer from the options given below
Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R
Assertion A: Infiltration rate is found to vary inversely with soil moisture content.
Reason R: With the increase in soil moisture content, the soil pores are filled with water.
In light of the above statements, choose the correct answer from the options given below
Assertion A: Infiltration rate is found to vary inversely with soil moisture content.
Reason R: With the increase in soil moisture content, the soil pores are filled with water.
In light of the above statements, choose the correct answer from the options given below
Show Hint
Dry soil has a high matric suction gradient, resulting in a high initial infiltration rate. As pores fill with water, this suction gradient drops to zero, and infiltration slows to a constant rate driven only by gravity.
Updated On: Aug 13, 2026
- Both A and R are true and R is the correct explanation of A
- Both A and R are true but R is NOT the correct explanation of A
- A is true but R is false
- A is false but R is true
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept:
Infiltration is the downward entry of water into the soil through its surface.
The rate of infiltration changes over time during a wetting event and is influenced by the initial and antecedent soil moisture conditions.
Detailed Explanation:
Let us analyze both statements:
- Assertion A: The infiltration rate is highest when the soil is dry and decreases as the soil moisture content increases, eventually reaching a constant, minimum rate (saturated hydraulic conductivity, \(K_c\)). This inverse relationship between soil moisture content and infiltration rate is a well-established principle. Thus, Assertion A is correct.
- Reason R: In dry soil, water movement is driven by both gravitational forces and strong matric suction gradients (capillary pull). As water infiltrates, soil pores fill with water, raising the moisture content. As the pores fill, the matric suction gradient decreases to zero, and water movement is driven solely by gravity. With the pores filled, the resistance to flow increases and the drive decreases, reducing the infiltration rate. Thus, Reason R is correct and directly explains why the infiltration rate varies inversely with soil moisture.
Step 2: Final Answer:
Both A and R are true, and R is the correct explanation of A, corresponding to Option (A).
Infiltration is the downward entry of water into the soil through its surface.
The rate of infiltration changes over time during a wetting event and is influenced by the initial and antecedent soil moisture conditions.
Detailed Explanation:
Let us analyze both statements:
- Assertion A: The infiltration rate is highest when the soil is dry and decreases as the soil moisture content increases, eventually reaching a constant, minimum rate (saturated hydraulic conductivity, \(K_c\)). This inverse relationship between soil moisture content and infiltration rate is a well-established principle. Thus, Assertion A is correct.
- Reason R: In dry soil, water movement is driven by both gravitational forces and strong matric suction gradients (capillary pull). As water infiltrates, soil pores fill with water, raising the moisture content. As the pores fill, the matric suction gradient decreases to zero, and water movement is driven solely by gravity. With the pores filled, the resistance to flow increases and the drive decreases, reducing the infiltration rate. Thus, Reason R is correct and directly explains why the infiltration rate varies inversely with soil moisture.
Step 2: Final Answer:
Both A and R are true, and R is the correct explanation of A, corresponding to Option (A).
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