Question

The correct sequence of soil development stages is:
A. Initial stage
B. Virile stage
C. Senile stage
D. Juvenile stage
E. Final stage

• A. A, C, B, D, E
• B. C, B, A, D, E
• C. A, D, B, C, E
• D. A, B, C, E, D

Hint:

Soil stages mnemonic: I Just Value Soil Forever. (Initial, Juvenile, Virile, Senile, Final).

Answer 1

The Correct Option is C

Concept: Soil weathering and development (pedogenesis) follow a chronological sequence from the parent material to a highly weathered, old soil. This is often described using the stages of a "life cycle."

Step 1: Identify the beginning.
Soil formation starts at the Initial stage (A), where the parent rock begins to disintegrate into unweathered material.

Step 2: Identify the growth stages.
The next stage is the Juvenile stage (D), characterized by rapid weathering and high nutrient content. This is followed by the Virile stage (B) (Peak/Mature), where the soil is at its most productive and has well-defined horizons.

Step 3: Identify the declining and concluding stages.
As weathering continues to the point where nutrients are leached out, the soil enters the Senile stage (C) (Old age). The process concludes with the Final stage (E), where the soil is chemically inert and dominated by resistant minerals like quartz.

Step 4: Final sequence construction.
The logical chronological order is: Initial $\rightarrow$ Juvenile $\rightarrow$ Virile $\rightarrow$ Senile $\rightarrow$ Final (A, D, B, C, E).