Delhi Police Head Constable Environment & Ecology

Environment includes all physical, chemical, and biological factors affecting organisms. Ecology studies relationships between organisms and their environment. The ecosystem is the basic functional unit where living (biotic) and non-living (abiotic) components interact

Biotic factors include plants, animals, microorganisms. Abiotic factors include air, water, soil, temperature, light

Producers → Primary Consumers → Secondary Consumers → Decomposers

Species Richness = Total number of species in an area. Higher biodiversity means greater ecosystem stability

Western Ghats, Eastern Himalayas, Indo-Burma region, and Sundaland

Air pollution causes respiratory diseases and acid rain. Water pollution leads to eutrophication and biomagnification. Soil pollution reduces fertility. Noise pollution affects hearing and mental health

Global warming causes sea level rise, glacier melting, extreme weather events. Greenhouse gases include CO2, CH4, N2O, and CFCs. Carbon footprint measures total greenhouse gas emissions.

Wildlife → Water → Air → EPA. Common Mistake #1: Students confuse National Parks with Wildlife Sanctuaries

National Parks have stricter protection, no human activity allowed. Wildlife Sanctuaries permit limited human activities like grazing

core, buffer, and transition. Another frequent error is mixing up endangered species with their habitats. Always connect specific animals to their exact locations. For example, Asiatic Lions are only in Gir National Park, Gujarat, not in any other sanctuary. Conservation strategies include in-situ (within natural habitat) and ex-situ (outside natural habitat) methods. In-situ includes National Parks and Sanctuaries.

Ex-situ includes zoos, botanical gardens, and seed banks. Understanding these distinctions helps answer conservation-related questions accurately.