Ethanol blending

Explanation

Pair 1 is correct: sugarcane is a key ethanol feedstock, and the water-intensity concern associated with flood irrigation can be addressed through drip irrigation — transforming cultivation practice rather than abandoning the crop. This reflects the principle that system design, not the crop itself, determines sustainability. Pair 2 is correct: the Ethanol Blending Programme structurally absorbs surplus production and creates an additional income floor for farmers while generating foreign exchange savings for India, because ethanol competes with fuel imports rather than with food. Pair 3 is conceptually wrong. India does not face chronic food scarcity; government-held grain stocks have consistently exceeded prescribed buffer norms by a very wide margin. The food-vs-fuel framing rests on a flawed zero-sum premise. When a country operates with large agricultural surpluses, directing a portion to ethanol does not deprive any household of food. The trade-off framing may apply in genuinely food-scarce economies but is misapplied to India's surplus context.

Explanation

Statement 3 is correct. Ethanol carries roughly two-thirds the energy per litre of petrol, so a higher blend delivers less energy per unit volume and fuel economy falls slightly — the effect is small and can be partly offset by engine tuning that exploits ethanol's higher octane. This is a physical property of the fuel, distinct from the emissions and import-substitution arguments for blending.

Explanation

Statement 1 is correct: the Ethanol Blending Programme operates through administered (government-set) procurement prices that are differentiated by feedstock route — sugarcane juice/syrup, B-heavy molasses, and C-heavy molasses each attract a distinct price, rather than a common price. This is a deliberate policy design. Statement 2 is correct: by setting relatively stagnant prices for the cane-juice and B-heavy routes (which divert more sugar from the food chain) while allowing the C-heavy route price to keep pace with market costs, the government nudges mills toward C-heavy molasses production. C-heavy molasses is a residual by-product formed after most of the sugar has already been extracted, so shifting ethanol output toward this route minimises the quantity of sugar diverted away from domestic consumption. Statement 3 is incorrect and reflects a common misconception. It is the cane-juice and syrup route — not the C-heavy molasses route — that diverts the most sugar from food use, because juice/syrup is essentially pre-crystallisation sugar that is channelled directly into fermentation. C-heavy molasses is the spent residue after maximum sugar extraction; producing ethanol from it removes very little usable sugar from the market. This is precisely why the government's 2023 intervention targeted the juice route (via a ban and then a quantitative cap) — not the C-heavy route — to protect domestic sugar availability.

Explanation

Statement 1 is correct: flex-fuel vehicles are indeed engineered to run on varying blends of petrol and ethanol, and the emission standards that govern them — including those for E85 and E100 fuels — are specified under Rule 115 of the Central Motor Vehicles Rules, 1989. The recent amendment to these rules extended the permitted fuel specifications to include E100 alongside E85. Statement 2 is incorrect: the permission to use E100 is restricted specifically to vehicles designed by original equipment manufacturers as flex-fuel vehicles. It does not extend to all petrol-powered vehicles. A standard petrol vehicle lacks the engine calibration, fuel system components, and materials compatibility required to run on nearly pure ethanol; using E100 in such vehicles would be both mechanically damaging and outside the regulatory permission. Statement 3 is correct: a core rationale of India's ethanol blending programme — including the National Biofuel Policy — is energy import substitution. By replacing imported crude-oil-derived petrol with domestically produced ethanol (largely from sugarcane and surplus foodgrains), India reduces its foreign-exchange outflow on petroleum imports, improves energy security, and supports domestic agricultural value chains. This strategic logic underpins successive targets for blending (E10, E20, and now E85/E100 for flex-fuel vehicles).

Explanation

All three pairs are correctly matched. E10 is a low-level ethanol blend (10% ethanol) broadly usable in conventional petrol vehicles. E85 is a high-ethanol blend (up to 85% ethanol) that demands specifically designed and certified flex-fuel vehicles — the critical principle here is that compatibility with lower blends such as E20 does not by itself confer suitability for E85; this is because fuel system components, materials, and engine controls must be purpose-built for high-ethanol operation. E100, a fuel consisting predominantly of ethanol, represents the upper end of the flex-fuel range and likewise requires dedicated vehicle certification. The broader significance is India's ethanol blending roadmap: as domestically produced ethanol displaces imported crude oil, the blend specifications rise progressively from E10/E20 toward E85/E100, each step requiring corresponding vehicle and infrastructure upgrades — and the certification framework under the Central Motor Vehicles Rules, 1989 is the regulatory mechanism that governs which vehicles may use which blends.

Explanation

All three pairs are correctly matched under India's Ethanol Blending Programme. First, sugarcane (molasses and juice) is the dominant feedstock for ethanol in India; in drought years, reduced cane output creates a direct food-vs-fuel conflict and constrains ethanol supply — central to the EBP's vulnerability. Second, the government holds surplus rice stocks through FCI and can redirect them to ethanol production, but it sells this rice to distilleries at roughly half the price it paid for procurement and storage, making it a costly subsidy instrument for the government. Third, maize (corn) is an increasingly used grain-based feedstock; diverting damaged or surplus grain to distilleries reduces its availability for animal feed, creating a downstream food-chain concern. Each pair therefore reflects a genuine and correctly stated aspect of EBP feedstock economics and the food-vs-fuel trade-off.

Explanation

Statement 1 is correct. E20 refers to a blend of 20% ethanol and 80% petrol. India's National Biofuel Policy and the Ethanol Blended Petrol (EBP) Programme have set progressive blending targets — with E20 as the target blend — to reduce crude oil imports, cut carbon emissions, and support domestic sugarcane and grain farmers. Statement 2 is incorrect. Ethanol has a lower calorific value (energy content per litre) than petrol, not a higher one. As a result, vehicles running on higher ethanol blends such as E20 typically experience a reduction in fuel economy — commonly estimated at around 2–6% for E20 — because more fuel must be burned to deliver the same energy output. This is a well-established concern with ethanol blending and a central point of criticism from consumers and vehicle manufacturers.

Explanation

India's Ethanol Blending Programme (EBP) draws upon multiple feedstock categories. Maize is a grain-based (starch-rich) feedstock: when ethanol producers divert maize, they compete directly with the livestock feed sector, since maize constitutes 50–55% of poultry feed — this is the classic food/feed vs fuel trade-off. Broken rice and other damaged foodgrains (including FCI surplus stocks unfit for human consumption) are another grain-based category used in ethanol production; diverting FCI stocks to animal feed rather than ethanol is precisely what the feed industry is now requesting, illustrating the competing uses. Sugarcane juice, B-heavy molasses, and C-molasses are sugar-based feedstocks: because they are byproducts of the sugar-milling process, their diversion to ethanol does not compete with food grain or livestock feed supply chains in the same direct way. All three pairs are therefore correctly characterised within the EBP feedstock classification framework.