Question:
The biogas production starts falling very steeply when the temperature is below:
The biogas production starts falling very steeply when the temperature is below:
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Bacteria hate the cold! They almost "go to sleep" below $20^{\circ}$C.
Updated On: May 5, 2026
- $35^{\circ}$C
- $30^{\circ}$C
- $25^{\circ}$C
- $20^{\circ}$C
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The Correct Option is D
Solution and Explanation
Step 1: Concept Biogas production is highly temperature-dependent because it relies on bacterial activity.
Step 2: Meaning Most methanogenic bacteria thrive in mesophilic ($25-40^{\circ}$C) or thermophilic ($45-60^{\circ}$C) conditions.
Step 3: Analysis As temperature drops, the metabolic rate of these bacteria slows down significantly. When temperatures fall below $20^{\circ}$C, the bacteria become largely inactive, causing a steep decline in gas production.
Step 4: Conclusion Production drops sharply below $20^{\circ}$C.
Final Answer: (D)
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