Microbes in Production of Biogas — Prelims Strategy

Prelims Strategy

To excel in NEET questions on 'Microbes in Production of Biogas,' a multi-pronged strategy is essential. Firstly, master the key terminology: clearly define biogas, anaerobic digestion, methanogens, and bio-slurry.

Understand that methanogens are archaea, not bacteria, and are obligate anaerobes. Secondly, memorize the composition of biogas: know that methane ($CH_4$) is the primary combustible gas (50-75%) and carbon dioxide ($CO_2$) is the second most abundant (25-45%).

Thirdly, understand the sequential stages of anaerobic digestion: hydrolysis, acidogenesis, acetogenesis, and methanogenesis, along with the general type of microbes involved in each. Fourthly, focus on the conditions: emphasize the absolute requirement for anaerobic conditions and the optimal temperature/pH ranges.

Fifthly, list the benefits: be able to articulate how biogas production contributes to renewable energy, waste management, and bio-fertilizer production. Finally, recall specific facts: remember the contributions of IARI and KVIC in India.

For conceptual questions, always think about the 'why' – why oxygen is detrimental, why different microbes are needed. For factual questions, precise recall of names and percentages is key. Be wary of trap options that confuse aerobic with anaerobic processes or misattribute roles to different microbial groups.