Mains Answer Writing Day – 10 : Oceanography & Marine Ecosystems

Strengthen your UPSC Geography Optional and GS Paper 1 preparation with Day 10 of the Mains Answer Writing Series. This practice set covers ocean circulation, coral reefs, ocean governance, deep-sea mining, thermohaline circulation, and marine ecosystems. The questions integrate static oceanography concepts with contemporary environmental and geopolitical developments.

Q1. Explain the mechanism of the Atlantic Meridional Overturning Circulation (AMOC). Analyze the meteorological consequences of its continuous slowdown on the global climate and the Indian Monsoon.

Marks: 15 Marks
Word Limit: ~250 Words

Q2. Differentiate between localized coral bleaching and thermal mass bleaching. Evaluate the ecological and economic impacts of the Fourth Global Mass Coral Bleaching event on tropical coastal ecosystems.

Marks: 15 Marks
Word Limit: ~250 Words

Q3. Explain Darwin’s Subsidence Theory of coral reef formation. What specific geographical and hydrological conditions are necessary for the sustained growth of coral reefs?

Marks: 10 Marks
Word Limit: ~150 Words

Q4. The High Seas Treaty (BBNJ Agreement) is considered a watershed moment in ocean governance. Discuss its key provisions and the geographical challenges in regulating marine areas beyond national jurisdiction.

Marks: 15 Marks
Word Limit: ~250 Words

Q5. Briefly explain the formation and geographical distribution of polymetallic nodules. What are the major ecological concerns associated with deep-sea mining in the abyssal plains?

Marks: 10 Marks
Word Limit: ~150 Words

Q6. Describe the vertical and horizontal distribution of temperature and salinity in the world’s oceans. How do these specific hydrological properties drive global thermohaline circulation?

Marks: 15 Marks
Word Limit: ~250 Words

Instructions for Aspirants

• Write answers within the prescribed word limit.
• Use maps, diagrams, and flowcharts wherever applicable.
• Illustrate concepts such as AMOC, thermohaline circulation, coral reef formation, and ocean currents with