Question

Given below are two statements, one is labelled as Assertion (A) and the other one is labelled as Reason (R).
Assertion (A): The notation of Munsell Colour Chat is 2.5YR5/6
Reason (R): hue is 2.5 YR, value is 5 and chroma is 6.
In light of the above statements, choose the correct answer from the options given below.

• A. Both (A) and (R) are true and (R) is the correct explanation of (A).
• B. Both (A) and (R) are true but (R) is NOT the correct explanation of (A).
• C. (A) is true but (R) is false.
• D. (A) is false but (R) is true.

Hint:

In Munsell notation, the slash symbol (/) always separates the Value (numerator) from the Chroma (denominator).
Remember the sequence: H V/C (Hue, Value, Chroma).

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
Soil color is a key physical property used to identify soil horizons, mineral composition, drainage conditions, and organic matter content.
The Munsell Soil Color Chart is the standard system used internationally to determine and record soil color objectively.
The Munsell system specifies color based on three variables: Hue, Value, and Chroma.

Step 2: Detailed Explanation:
Assertion (A): A standard soil color entry is recorded using a precise alphanumeric notation, such as 2.5YR 5/6.
This notation allows scientists to communicate exact soil colors without subjective descriptions like "yellowish-brown." Thus, Assertion (A) is true.
Reason (R): The Munsell notation is structured as Hue Value/Chroma.
- Hue: Represents the dominant spectral color (relation to red, yellow, green, blue). In 2.5YR, "YR" stands for Yellow-Red.
- Value: Indicates the relative lightness or darkness of the color, ranging from 0 (absolute black) to 10 (absolute white). Here, the value is 5.
- Chroma: Represents the relative purity, strength, or saturation of the color, ranging from 0 (neutral grey) to 8 or more. Here, the chroma is 6.
This breakdown directly explains why the notation is written as 2.5YR 5/6.
Therefore, both statements are true, and (R) is the correct explanation of (A).

Step 3: Final Answer:
Both statements are true, and (R) is the correct explanation of (A).