Question

Match List-I with List-II

Choose the correct answer from the options given below:

• (A) - (I), (B) - (III), (C) - (II), (D) - (IV)
• (A) - (I), (B) - (II), (C) - (III), (D) - (IV)
• (A) - (I), (B) - (II), (C) - (IV), (D) - (III)
• (A) - (III), (B) - (IV), (C) - (I), (D) - (II)

Hint:

To solve matching questions quickly, look for direct name matches:
- Stokes law matches Stokes.
- Baule unit matches Baule.
These two simple links are sufficient to identify the correct option.

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
This question covers foundational theories and parameters in soil physics, physical chemistry, plant nutrition, and soil salinity.
Each concept is associated with the scientist who originally formulated or proposed it.

Step 2: Detailed Explanation:
- (A) Stokes law: Formulated by G. G. Stokes in 1851.
It describes the terminal settling velocity of spherical particles in a viscous fluid medium. This law is the physical basis for soil texture analysis using hydrometer or pipette methods. Thus, (A) matches (III).
- (B) Baule unit: Proposed by Bernhard Baule in 1918.
It represents the quantity of a nutrient required to achieve 50% of the maximum potential crop yield. Thus, (B) matches (IV).
- (C) Lime potential: Proposed by Schofield and Taylor in 1955.
It is expressed as \( \text{pH} - 0.5 \text{pCa} \), which serves as an index of the lime status and base saturation of acid soils, independent of soil-water ratios. Thus, (C) matches (I).
- (D) Salt index: This is associated with Puri (or is a key parameter used to characterize soil salinity). Thus, (D) matches (II).
Combining these pairs gives: (A) - (III), (B) - (IV), (C) - (I), (D) - (II).
This matches Option (D).

Step 3: Final Answer:
The correct matching sequence is (A) - (III), (B) - (IV), (C) - (I), (D) - (II).