Step 1: Understanding the Problem:
Decomposition is the complex, multi-step process by which complex organic matter (detritus) is broken down into simple inorganic substances by decomposers.
Step 2: Approach and Formula:
Identify the chronological sequence of the physical, chemical, and biological steps that detritus undergoes as outlined in standard ecology texts.
Step 3: Detailed Explanation:
The process of decomposition involves five major sequential/simultaneous steps. The logical physiological sequence presented typically flows as:
1. Fragmentation: Detritivores (like earthworms) physically break down the detritus into smaller particles, increasing the surface area.
2. Leaching: Water-soluble inorganic nutrients seep down into the soil horizon and get precipitated as unavailable salts.
3. Catabolism: Bacterial and fungal enzymes chemically degrade the fragmented detritus into simpler inorganic substances.
4. Humification: Accumulation of a dark-coloured, highly resistant amorphous substance called humus in the soil.
5. Mineralization: The final slow degradation of humus by certain microbes to release inorganic nutrients back into the soil.
Therefore, the broadly accepted ordered sequence is Fragmentation $\rightarrow$ Leaching $\rightarrow$ Catabolism $\rightarrow$ Humification $\rightarrow$ Mineralization.
Step 4: Final Answer:
The correct sequence is option (2).