Key Concepts & Self-Assessment15 Key Facts
Review key World Deserts, Polar Regions & Tundra Biomes: Geomorphology & Adaptations exam facts and rate your mastery to track revision.
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#1
Subtropical hot deserts (such as the Sahara and Thar) form under high-pressure atmospheric subsidence along the Horse Latitudes (25°–35° N/S).
#2
The Atacama Desert is the driest non-polar desert on Earth, formed by the rain-shadow effect of the Andes and the cold Humboldt Current.
#3
Cold continental deserts, including the Gobi and Ladakh, develop due to extreme distance from oceans and massive mountain rain shadows.
#4
The tundra biome is characterized by permafrost, brief vegetative growing seasons, and vegetation dominated by mosses, lichens, and dwarf shrubs.
#5
The United Nations Convention to Combat Desertification (UNCCD, 1994) coordinates international efforts to achieve Land Degradation Neutrality.
#6
The Sahara Desert in North Africa spans over 9.2 million square kilometres across eleven countries, making it the largest subtropical hot desert on Earth.
#7
The Namib Desert along the Atlantic coast of southwestern Africa is one of the oldest deserts, maintained by the cold Benguela Current producing coastal advection fog.
#8
Erg deserts consist of vast wind-swept sand seas and mobile dunes, whereas reg deserts feature hard gravel pavements, and hamada deserts consist of barren, rocky plateaus.
#9
Antarctica constitutes the world's largest desert overall, covering 14.2 million square kilometres with interior annual precipitation averaging under 50 millimetres.
#10
The Antarctic Treaty, signed in Washington on December 1, 1959, by 12 nations, preserves the continent exclusively for peaceful scientific research and prohibits military activity.
#11
India operates two active permanent research stations in Antarctica: Maitri (established in 1989 in the Schirmacher Oasis) and Bharati (commissioned in 2012 in the Larsemann Hills).
#12
India established Himadri in 2008 at Ny-Alesund in Spitsbergen, Svalbard, Norway, as its dedicated Arctic research station.
#13
Permafrost is defined as ground that remains continuously below 0 degrees Celsius for at least two consecutive years, underlying roughly 24% of the Northern Hemisphere land surface.
#14
Xerophytic desert plants develop adaptations such as sunken stomata, thick waxy cuticles, and Crassulacean Acid Metabolism (CAM) to minimize transpirational water loss.
#15
The Great Green Wall initiative, launched by the African Union in 2007, aims to restore 100 million hectares of degraded land across the 8,000-kilometre Sahel belt.
Subject Specialist Commentary
Analytical perspective & practical exam advice from the Master10 academic board
Deserts and tundra biomes represent extreme environments shaped by severe water deficits or freezing temperatures. Subtropical hot deserts like the Sahara and Thar form along the Horse Latitudes between 25° and 35° where dry air descends under high pressure. Coastal deserts like the Atacama and Namib are dried out further by cold ocean currents and mountain rain shadows. In contrast, the polar tundra biome features permanently frozen soil called permafrost, restricting vegetation to low mosses, lichens, and dwarf shrubs.
In UPSC and State PSC geography papers, examiners frequently link desert locations to ocean currents. A popular question trap asks about the driest non-polar desert on Earth: it is the Atacama in South America, formed by the Andes rain shadow and the cold Humboldt Current. For polar ecology MCQs, remember that trees cannot grow in the Arctic tundra because permafrost blocks deep root growth. In environmental revision, note that the UNCCD coordinates global efforts against desertification.
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