(a) Why is oil important for energy security? What is the role of oil in clean energy transition? (20 marks)

(b) Critically evaluate the role of primate cities in dominating the urban spheres of influence in developing countries. (15 marks)

(c) "Th

Question

(a) Why is oil important for energy security? What is the role of oil in clean energy transition? (20 marks)

(b) Critically evaluate the role of primate cities in dominating the urban spheres of influence in developing countries. (15 marks)

(c) "The global demographic landscape is evolving with rapid population growth in some places and rapid ageing in others." Elucidate with examples. (15 marks)

UPSC Answer Check · Accepted Answer

Oil and energy security
Oil remains central to energy security because it is the dominant fuel for transport, with a global share above 90%, and because heavy freight, aviation and marine shipping still lack immediate low-carbon substitutes. Its energy density and established supply chains make it difficult to replace quickly. For import-dependent economies such as India, crude imports create exposure to price volatility, exchange-rate shocks and geopolitical supply risk; the import bill affects inflation, the current account and fiscal transfers, so strategic petroleum reserves, diversified sourcing and fiscal buffers are treated as security instruments rather than mere commercial policy. Oil’s role as a bridge fuel is narrow: oil-fired generation may have served as a stop-gap in some power transitions, but it does not balance renewable variability; gas, hydro and storage do that. Oil can still act as a stop-gap in hard-to-electrify transport and industrial uses, and it supplies petrochemical feedstocks for wind turbine blades, solar panel components and EV plastics. Yet under IEA Net Zero 2050 scenarios, oil demand must fall sharply; continued dependence risks stranded assets and locks in emissions, so its transition role is limited and time-bound.

Primate cities
A primate city is disproportionately larger than the second city, as in Mark Jefferson’s law, and examples include Mexico City, Buenos Aires, Bangkok and Lagos. Their dominance over national urban spheres of influence is produced by cumulative causation, agglomeration economies, political centralization and concentrated infrastructure—ministries, ports, universities and financial institutions—which draw firms, skilled labour and public investment into one urban core. In India, Mumbai’s financial, port and service-sector concentration illustrates how a primate city can dominate economic and cultural life. Critically, however, this dominance is not absolute. Secondary cities such as Pune, Hyderabad and Surabaya are growing and benefiting from decentralized industrial policies, better connectivity and digital economy opportunities that reduce some spatial concentration. Polycentric urban regions are emerging, but these counter-trends do not yet offset the primacy of Mumbai or Jakarta; they mainly soften it. The verdict is that primate dominance remains structurally strong in developing countries, but it is being moderated by policy and technology.

Demographic divergence
The demographic landscape is splitting between rapid growth and rapid ageing. In Sub-Saharan Africa and parts of South Asia, populations are expanding quickly: Nigeria is projected to reach about 375 million by 2050, while the DRC, Ethiopia, Pakistan, Afghanistan and Yemen still have high fertility, with Yemen around 3.7; Bangladesh adds large absolute numbers. Declining but still high mortality and a large youth cohort create a youth bulge, implying future labour supply but also pressure on education, jobs and migration. In East Asia and Europe, ageing is rapid: Japan’s median age is about 48.6, South Korea’s about 44.5, China’s demographic dividend is ending, and Germany and Italy face similar low-fertility, high-longevity pressures. Low fertility and increased longevity raise old-age dependency ratios; in Japan the ratio is around or above 50%, while in Italy it is about 37%, Germany about 33%, South Korea about 25% and China about 20%. Where ratios approach or exceed 50%, pension and health-care burdens become acute. These divergences are interconnected: ageing economies face labour shortages and pension pressure, while youthful regions face job creation and migration pressure, shaping global labour flows, consumption patterns and resource demand.

Overall, oil’s security importance is high, but its clean-transition role is paradoxical and shrinking. Primate city dominance is real and still dominant, though secondary-city growth is moderating it. Demographic divergence will increasingly determine migration, labour markets and consumption, and energy transitions will shape urbanization patterns, which in turn influence demographic outcomes.

(a) Why is oil important for energy security? What is the role of oil in clean energy transition? (20 marks) (b) Critically…

Model answer

What "Critically evaluate" is asking you to do

Structure that answers it

Where marks are lost

How this answer will be evaluated

Approach

Key points expected

Evaluation rubric

Must cover

Loses marks

Earns more

Extra mark

Must cover

Loses marks

Earns more

Extra mark

Must cover

Loses marks

Earns more

Extra mark

Practice this exact question

More from Geography 2025 Paper I