Question

Arrange the following steps of decomposition in the correct order of their sequence:
(A) Humification
(B) Fecal Matter
(C) Leaching
(D) Mineralisation

• A. (A), (C), (B), (D)
• B. (D), (B), (A), (C)
• C. (B), (C), (A), (D)
• D. (A), (D), (C), (B)

Answer 1

The Correct Option is C

The correct order of decomposition involves several distinct processes. Let's break them down step-by-step: 

1. Fecal Matter (B): The decomposition process begins with the breakdown of dead organic matter by decomposers and the production of fecal matter.
2. Leaching (C): Soluble substances are washed away from the decomposing material by moisture, leaving behind concentrated organic material.
3. Humification (A): The remaining organic matter is further decomposed to form dark, stable, and carbon-rich substances called humus.
4. Mineralisation (D): The final stage where the humus is broken down into simple inorganic substances, releasing minerals back into the ecosystem.

The correct sequence of decomposition is therefore: (B), (C), (A), (D).

Answer 2

The correct sequence of decomposition steps involves several stages, starting from the breakdown of organic matter and progressing toward nutrient recycling. Here's the breakdown of the steps:

(B) Fecal Matter: Decomposition begins with the breakdown of organic matter, including fecal matter, which provides a starting point for microbial activity.

(C) Leaching: This step involves the washing away of soluble nutrients and minerals from the decomposing matter by water. These nutrients are transported into the soil.

(A) Humification: In this stage, the organic matter is partially decomposed to form humus, which is rich in nutrients and contributes to the soil's fertility.

(D) Mineralisation: The final step in decomposition is mineralisation, where the organic nutrients in humus are broken down into simple inorganic substances (like minerals) that can be used by plants.

Thus, the correct order is:

(B) Fecal Matter, (C) Leaching, (A) Humification, (D) Mineralisation.

Correct answer: (3) (B), (C), (A), (D).