Title Organisms-and-Populations.pdf ✅

3. Organisms and Populations y The major biomes of the world are: ⚪ Arctic and Alpine tundra ⚪ Coniferous forests ⚪ Temperature forests ⚪ Grassland ⚪ Tropical forests ⚪ Desert y Formation of a wide variety of habitats occur due to regional and local variations within each biome. y On Earth, life exists not only in few favourable habitats but also in extreme and harsh habitats like deep in the oceans , polar regions, boiling thermal springs, snow covered mountain,in human gut,etc. y The key elements which lead to the variations in the physical and chemical conditions of different habitats include the biotic and abiotic factors. y The biotic factor include pathogens and parasites, predators, competitors, etc. y The abiotic factors of the environment are temperature, water, light and soil. Previous Year’s Question Which one of the following pairs is mismatched? (1) Tundra permafrost (2) Savanna Acacia trees (3) Prairie Epiphytes (4) Coniferous forest Evergreen trees Previous Year’s Question The measure of maximum rate of reproduction under optimal conditions is called (1) Ultimate level (2) Carrying capacity (3) Proximal level (4) Biotic potential Rack Your Brain What are the main causes of variation in a given species?