Biogeography and Soils
UPSC notes on biogeography and soils — soil formation, profiles and processes, the soils of India, soil degradation, and the world's major biomes.
SyllabusGS I · Salient features of world physical geography; distribution of key natural resources
Biogeography studies how plants, animals and soils are distributed over the Earth and why. Soils sit at the meeting point of rock, climate and life: the same parent rock gives very different soils under a tropical rainforest and a desert. The world’s biomes — rainforests, savannas, deserts, grasslands, taiga and tundra — follow the same climatic controls.
What UPSC asks
- Prelims: the properties and distribution of Indian soil types (black, red, laterite, alluvial, arid, saline), soil-forming processes, the soil profile, and matching grasslands or biomes to continents.
- Mains GS I and GS III: soil degradation and desertification, soil health and its link to agriculture, and how climate shapes natural vegetation.
Key sub-topics
| Theme | Topics |
|---|---|
| Soil science | Factors of soil formation, soil profile, laterisation, podzolisation, calcification, salinisation |
| Soils of India | Alluvial, black, red and yellow, laterite, arid, saline, peaty, forest soils |
| Soil degradation | Erosion, salinity and waterlogging, desertification, conservation |
| Biomes | Tropical forests, savannas, deserts, Mediterranean, temperate grasslands and forests, taiga, tundra |
| Biogeographic realms | Zoogeographic realms; Wallace’s Line |
Start with Soil Formation and the Soils of India, then Major Biomes of the World.
Soil Formation and the Soils of India
Soil formation factors and processes, the soil profile, India's eight major soil types with properties and …
Major Biomes of the World
The world's major biomes — rainforest, savanna, desert, Mediterranean, grassland, taiga, tundra — with …
Biogeography and Soils — Practice Questions
UPSC Prelims-pattern practice questions on soils and biomes — alluvial, black, laterite and saline soils, soil …
Biogeography and Soils — Quick Revision
One-page UPSC revision of soils and biomes: soil-forming factors and processes, soil profile, India's eight …