Social Science (087) — AI-generated practice question

Benefit 1 — Environmental benefit: Burning firewood and dung cakes releases smoke and pollutants, contributing to deforestation and air pollution. Biogas burns more cleanly and prevents the loss of trees, thereby helping conserve forest cover and reducing environmental degradation.

Benefit 2 — Agricultural productivity: When dung cakes are burnt as fuel, valuable manure is wasted. Biogas plants use cattle dung (Gobar gas plants) and the residual slurry left after gas production is improved quality manure. This enriched manure can be applied to fields, directly boosting the agricultural productivity of the household.

Thus, biogas provides twin benefits: cleaner energy for cooking and better manure for farming.

Source: Non-Conventional Sources of Energy, Chapter 5

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• The textbook explicitly states biogas provides "twin benefits — energy and improved quality of manure" — examiners expect both points.
• Mention Gobar gas plant by name for full marks.
• Do not just say "biogas is clean" — link it specifically to preventing loss of firewood/trees (environment) and preventing burning of dung so manure is preserved (agriculture). These are the two specific angles the question demands.
• At 3 marks, two well-explained points (not just listed) is the right approach.