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Model Answer Frameworks
5-Mark Answer Template: Set 1 (50 words)
Question: What is the significance of the Luni River in Rajasthan? Why is its water saline below Balotra?
Model Answer:
Luni (495 km) is western Rajasthan's longest river, originating near Pushkar (Ajmer). It drains Thar Desert districts — Jodhpur, Pali, Barmer, Jalore — before terminating in Rann of Kutch. Below Balotra (Barmer), the river picks up salt-bearing geological deposits from the Aravalli-Marwar transition zone, rendering water unfit for irrigation — hence called the "Salt River."
Word count: ~52 | Word budget: Origin+length (12) + drainage area (12) + salinity cause (16) + implication (12)
5-Mark Answer Template: Set 2 (50 words)
Question: Name the physiographic divisions of Rajasthan with their respective percentage area shares.
Model Answer:
Rajasthan has four physiographic divisions: (1) Western Sandy Plain / Thar Desert — 61.11%; (2) Eastern Plains — 23.0%; (3) Aravalli Range — 9.3%; (4) South-Eastern Plateau (Hadoti) — 6.6%. Together they cover 3,42,239 sq km. The Aravalli Range acts as the watershed dividing Arabian Sea and Bay of Bengal drainage systems.
Word count: ~52 | Word budget: Four divisions with data (35) + total area (7) + Aravalli watershed significance (10)
10-Mark Answer Template (150 words)
Question: Classify the rivers of Rajasthan according to their drainage basins and briefly describe each system.
Model Answer:
Introduction: Rajasthan's rivers are classified into three drainage systems based on their destination — Arabian Sea, Bay of Bengal, and inland.
Key Points:
Arabian Sea drainage (~10% area): Luni (495 km, Pushkar origin) is the principal river, joined by tributaries Jawai and Sukri; drains Thar districts into Rann of Kutch. Mahi and Sabarmati's upper headwaters also fall here.
Bay of Bengal drainage (~30% area): Chambal (966 km total, 322 km in Rajasthan) is the only perennial river; Chambal Valley Project dams (Gandhi Sagar, Rana Pratap Sagar) generate ~386 MW. Banas (480 km, entirely within Rajasthan, Bisalpur Dam) and Kalisindh-Parvati also drain eastward.
Inland drainage (~60% area): Largest system by area; Ghaggar, Kantli, Kakni, and Saraswati (dry) lose water to desert sands before reaching any sea. Covers Thar core districts.
Conclusion: The Aravalli Range forms the primary watershed divide between all three systems, underscoring its geographic centrality to Rajasthan's hydrology.
Word count: ~152
10-Mark Answer Template: Set 2 (150 words)
Question: Describe the major saltwater and freshwater lakes of Rajasthan with their geographic and economic significance.
Model Answer:
Introduction: Rajasthan has two distinct lake categories — western saltwater playas (inland drainage depressions) and eastern/southern freshwater lakes (natural and artificial).
Key Points:
Sambhar Lake (Jaipur–Nagaur–Ajmer, 240 sq km) is India's largest inland saltwater lake; a Ramsar site (1990); produces ~2.5 lakh tonnes of salt annually; critical flamingo habitat.
Pachpadra (Barmer) and Didwana (Nagaur) are smaller saltwater lakes; Didwana uniquely produces sodium sulphate for glass/paper industries via the Rajasthan State Chemical Works.
Jaisamand Lake (Udaipur, ~87 sq km, built 1685–91 by Maharana Jai Singh) was historically Asia's second-largest artificial lake; marble chhatris and wildlife sanctuary enhance its heritage value.
Pushkar Lake (Ajmer) — only Brahma temple in India on its banks; annual Pushkar Mela attracts 3–4 lakh visitors; under conservation since 2016.
Conclusion: Rajasthan's lakes serve multiple functions — economic (salt, sodium sulphate), ecological (Ramsar wetlands), heritage (Mewar royal lakes), and religious (Pushkar, Pichola) — making their conservation both a cultural and resource priority.
Word count: ~152