Biogeography and Environmental Geography (soils, biomes, biodiversity, hazards)
Biogeography and environmental geography link soils, biomes, biodiversity and hazards. The exam tests soil-forming factors, biome–climate matching, hotspot criteria and hazard management.
Core rules
- Soil forms from parent material, climate, organisms, relief and time; a profile shows O, A, B, C and R horizons.
- Biomes are large climate-linked communities: tropical rainforest, savanna, desert, temperate grassland, taiga and tundra.
- Biodiversity hotspots need high endemism and serious habitat loss; India includes the Western Ghats–Sri Lanka, Himalaya, Indo-Burma and Sundaland (Nicobar) hotspots.
- A hazard is a potential event; a disaster occurs when it overwhelms vulnerability and capacity.
- Management combines structural measures (embankments, dams) and non-structural measures (land-use zoning, warning systems, insurance).
Worked example
Why are the Western Ghats a biodiversity hotspot? The answer must use both criteria. The range has high species richness and many endemic frogs, lizards and plants; it has also lost a large share of original forest to plantations, settlements and roads. High endemism alone is not enough, and scenic value is irrelevant. A good answer adds a management response, such as protecting corridors and regulating construction.
Traps
Do not confuse a biome with an ecosystem; a biome is a broad climatic unit. Do not list hotspots without the two criteria. Do not call every hazard a disaster. Do not reverse the soil horizons or claim laterite is fertile without qualification.