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ICAR JRF Aquatic Environmental Management 29 Jun 2024Shift 1
MCQ (Single Correct) +4 −1
Depending on chemical nature, the decomposition of which organic matter is rapid?-
  • Decomposition Kinetics of Organic Fractions:
  • The susceptibility of organic macromolecules to microbial enzymatic decomposition follows a predictable biochemical hierarchy:
$$\text{Simple Sugars} \approx \text{Starch} \gt \text{Crude Proteins} \gt \text{Hemicellulose} \gt \text{Cellulose} \gt \text{Lignin} \approx \text{Resins}$$
  • Starch consists of $\alpha(1\to 4)$ and $\alpha(1\to 6)$ glucosidic bonds readily hydrolyzed by ubiquitous microbial $\alpha$-amylases, undergoing the most rapid decomposition.
  • Correct Option: Option 4 (Starch).
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